From passive house to passive buildings–what’s new and how manufacturers are stepping it up

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Exciting times indeed for passive building in the United States: Passive design principles that originated here and in Canada are all grown up and making a furious comeback. Policy makers, researchers and scientists, builders and designers are all embracing passive building in their everyday practice.

And as always, the growth is evident here at NESEA’s annual high-performance tour de force: NESEA BE15. A quick recap: Passive Building Place–a concentration of passive building component exhibitors, and the tour of their offerings, is in its fourth consecutive year. For those who remember, we started my first blog on the NESEA trade show focusing on passive house products in 2012. Passive building was still tiny then compared to what it has grown into now.

PHIUS and its membership organization the Passive House Alliance US (PHAUS) – the leading passive building research institute and alliance in the US – is the anchor of Passive Building Place for the fourth straight year.

NESEA never stands still. In its topic selection for conference workshops and presentations it continues to ask the tough questions and pushes the boundaries. I am talking about the passive building standard adaptation work we have been doing on Tuesday in a half day workshop. On Wednesday afternoon as part of the core conference I’ll be presenting about very exciting multifamily developments specifically. The Passive Building Place has become a mainstay and is expanding every year with new manufacturers who have recognized that passive building will be a significant driver for high performing materials and components.

Larger projects like Orenco Orchards in Eugene, Ore.,  by CPHC® Dylan Lamar and GreenHammer are coming on strong–they need more manufacturers to step up to the multifamily and commercial passive building market.

But, as multifamily and commercial projects come on strong, we see hesitation amongst manufacturers regarding new components and material needed for larger building developments. This follows the past trend with single family passive homes: the architects and CPHC®s (Certified Passive House Consultants) have taken on the design of the first larger buildings find themselves ahead of the curve.

While this might sound glamorous to some, in practice it is quite a challenge for the teams. Architects are out to make ambitious reductions in energy and carbon with large buildings, and they need appropriate high performance components. In principle, much of what’s been learned and accomplished in single family applications is transferable. Ideally, however, manufacturers will develop turnkey and warranted solution packages for multifamily and other large buildings. What about superinsulated thermal bridge free airtight curtain wall systems? Is this too much to ask for?

Here’s a good place to start: At last year’s 9th Annual North American Passive House Conference in San Francisco, five leading multifamily passive building teams came together for a presentation.  The one component they all wanted was a fire-rated door, that complies with ADA requirements of a low threshold, is airtight and has exceptional thermal performance comparable to the passive house windows that have taken the BE Passive Building Place by storm over the past few years.

To see what’s cooking this year, we are back for another tour of the trade show with you! I will have the pleasure of guiding a tour on Wednesday, March 4 beginning at 5.30 pm just before the boat tour. We’ll be visiting exhibitors who offer products and components germane to the passive building community. We will stop at selected passive building place exhibitors and Passive House Alliance sponsors inside and outside Passive Building Place. Because there are so many it’s impossible to visit all–instead we’ll focus on innovations and a more in depth conversation of 5-10 minutes discussing the manufacturers’ products.

Also different this year:  We will take the investigative role and instead of highlighting the passive building products we’ve seen in past years, we will challenge vendors with a different question: What are you doing to support larger passive building developments? Are you seeing the effects from it in your practice and what are you doing to respond, to prepare for it? Are there new offerings in the pipeline? What are designers asking for, what is missing?

Our goal is to identify the gap so that we can fill it. We like to inspire manufacturers to take the growth in passive building seriously. Please join us on this tour to hear from manufacturers what they are hearing and to ask the right and tough questions to inspire more high performing systems development for larger U.S. passive buildings.

Twenty-four exhibitors are joining us this year in the Passive Building Place or elsewhere on the floor–they include sponsors of PHAUS, firms with PHIUS certified professionals on staff, firms offering PHIUS verified windows or doors, or that are collaborating with PHIUS/PHAUS otherwise. Those partners are listed here:

475 High Performance Building Supply (Booth # 759)

Auburndale Builders (Booth # 913)

Bright Build Home (Booth # 549)

Conservation Services Group (Booth # 709)

Fraunhofer CSE (Booth # 660)

H Window/Energate (Booth # 642)

Huber Engineered Woods (Booth # 743)

Klearwall Industries LLC (Booth # 862)

Intus Windows (Booth # 624) PHAUS Green Sponsor

Marvin & Integrity Windows (Booth # 939) PHAUS Silver Sponsor

Mitsubishi Electric (Booth # 707) PHAUS Silver Sponsor

New England Homes by Preferred Building Systems (Booth # 919)

Passive House Institute US/Passive House Alliance (Booth # 753)

Pinnacle Windows Solutions (Booth # 763)

PowerWise Systems (Booth # 814)

PROSOCO Inc. (Booth # 949) PHAUS Green Sponsor

Roxul (Booth # 860)

Schock (#636)

SIGA Cover, Inc. (Booth # 620)

Steven Winter Associates (#844)

Stiebel-Eltron Inc. (Booth # 749)

Yestermorrow Design/Build School (Booth # 1036)

Zehnder America, Inc. (Booth # 864) PHAUS Friend Sponsor

Zola Windows (Booth # 755) PHAUS Friend Sponsor

 

We won’t have time to stop at all passive building component vendors, but we urge you to stop check them all out as you find time. Make sure to stop by:

Dryvit (Booth # 430)

Enovative (Booth # 945)

European Architectural Supply (Booth # 727)

Fantech (Booth # 828)

Foard Panel (Booth # 830)

Green Fiber (Booth # 717)

Led Waves (Booth # 628)

Main Green Building Supply (Booth # 622)

Retrotec (Booth # 541)

Sanden International (# 563)

Schock USA (Booth # 636)

Tremco Barrier Solutions (Booth # 719)

Viessmann Manufacturing (Booth # 565)

Yaro DSI (Booth # 638)

Thank you all for participating in this and putting your weight behind this exciting emerging construction market. Again, you are true leaders in this market transformation towards high performance building products that is so needed to achieve zero/positive energy buildings through passive design. Thanks again for joining!

And have a great BE15!

The North American Passive House Conference in San Francisco – a hard act to follow for NAPHC2015 (in Chicago)

Every year we say “This was the best passive house conference ever, we better stop now, we can’t possibly top this experience, the quality of the presenters, the “meat on the building science bones” presentations, technical details and specific construction solutions, cutting edge projects of all building types showcased throughout all climate zones, policy and government role discussions and incentives… and this year in addition to the Builders’ Hootenanny the Architects’ Hootenanny which, you might have guessed, was a hoot.

Let me take this opportunity to thank our community of longstanding CPHCs, PHIUS Certified Builders and PHIUS+ Raters who have shared this passive building path with us now for almost 10 years. It has been a pleasure knowing so many great folks with their hearts in the right place and a common characteristic: a determined pioneering spirit to make the energy transition in the way we build and live happen. Thanks to all passive building practitioners and to newcomers to the conference especially the international speakers from the UK and Japan.

Together you submitted nearly 100 abstracts and we had a hell of a time to choosing the best ones. We ended up with an unprecedented total of 72 sessions in 4 tracks this year, more than ever before (we cut the plenary short upon your request to get to the meaty sessions quicker and to have more of them).

Special thanks go to Sam Rashkin from the DOE, for his invaluable contributions to the tracks on government perspective and for the great partnership he and the DOE have provided to the PHIUS+ certification program over the past couple of years. Sam took time to be with us on the Sunday tour of passive buildings in the bay area, which was a lot of fun.

I would especially like to thank all of our outstanding pre-conference workshop presenters who covered topics in great depth, most popular were the Multifamily Palooza (kicked off by Chris Benedict who currently leads the field with the most passive projects in this sector realized), Passive Building Science with Joe Lstiburek (our unofficial lounge sponsor), packed the house closely followed by Mechanical Systems and commercial applications. Many thanks to the outstanding instructors who tackled more specific technical issues and new frontiers, such as efficient water systems design by Gary Klein, and Matthias Patzold from the Fraunhofer IBP and PHIUS staff presenting on dynamic energy modeling in WUFI Passive, THERM/windows modeling and PHIUS+ certification QAQC during the rater training. To all our presenters, pre-conference and main session: Thank you all so much! It would have not been possible without you!!!!

We owe many thanks to Michael Hindle, our charismatic Master of Ceremonies, and President of the Board of Managers of Passive House Alliance US (PHAUS). His opening speech was inspiring, artful and philosophical, The Passive House Alliance is now 16 chapters strong with 7 more in formation all over the country. It is starting to develop an impressive momentum regarding advocacy for passive buildings across the nation. Michael pledged to the membership that he would keep increasing member benefits and participation opportunities and closed with a call for action to join the many committees that have been formed to get the work done.

Michael also made a very well received announcement: the PHAUS  board has moved to remove any reference to a specific passive house standard from chapter founding documents. This decision rightly recognizes that since the inception of the passive house concept in the 70s in North America, it has undergone more than just one transformation and that evolution and learning will continue. It must continue to evolve for us to be successful. PHAUS leadership supports the new climate specific Passive Building standards brought forward by PHIUS as part of such evolution.

Bill Rose followed with the most thoughtful, most provocative keynote given at the North American Passive House Conference yet. Many of you came to me afterwards expressing that sentiment. He showed a short video recording from the early 70s of the researchers credited with formalizing the superinsulation/passive concepts. They worked at the Small Homes Council, University of Illinois at Urbana-Champaign in Illinois. The video reinforced the notion that the passive house community has a longstanding history here in the United States. He then showed a document written by the Nixon administration predicting peak oil and climate change to happen in 2010. It was a stunning piece of evidence that the issues had been known then, as well as the possible remedies outlined in the document. The document, then issued a clear call for action, recognizing the emerging passive community as having the best approach for reducing the demand side of buildings.

Rose made clear that facing the climate crisis means we also need to step up to transform the supply side of the system, coming up with strategies of how to keep the fossil fuel reserves in the ground and how to challenge the current economies that are all built around such assets. He ended provocatively saying, that we need to get to a point where we will be saying: “Energy (fossil fuels), what’s that?”

After the keynote and during all breaks, the exhibit hall was buzzing. A big thank you to all exhibitors of high performance materials and technologies! Every year the cast has been expanding significantly and new useful materials and systems manufacturers join the core group of providers. Thank you, without your products and services it would be impossible to realize passive buildings as well as we now do. Of course, also thank Exhibit Hall sponsor Bayer MaterialScience and our lanyard sponsor Hayward Lumber. Bill Hayward joined us on the tour and provides some great local background. Be sure to check the Hayward Health Home, a very cool initiative.

Achilles Karagiozis delivered the closing keynote. He spoke on the view forward, the implementation of passive buildings worldwide in all different climate zones and the challenges and responsibilities that come with it. He stressed the importance of dynamic modeling for accurate energy prediction results as passive building is applied in different climate zones. He cited an astounding example: WUFI Passive is now able to predict insulation material dependence on temperature on an hourly basis. And of course, this is important to assess hygrothermal performance of enclosures as well as to get the energy balances calculated with more accurate granularity. A great new age has arrived for us designers to manage our risks in designing passive buildings, thanks to the emergence of more powerful computing capabilities that make dynamic models feasible.

At closing, maybe best of all, the incredible sense of community of people who trust each other and know each other well:  We have been coming together now for almost a decade, reuniting at this amazing annual event working together to devise solutions for the North American market, its climate zones and building sector.

And this year, for the first time, the event was held in one of the largest and most exciting metropolitan areas: the San Francisco Bay area. This meant a significant step up from the previous conferences and importance in visibility of our community to city and government leaders, in California and beyond.  Passive building has turned the corner. And so has PHIUS as we were more than once told during the event by you.

PHIUS’ Senior Scientist Graham Wright’s presentation on new North American Passive Building Standards that are currently being completed under a DOE Building America grant was very well received: “This sounds like a really good program” was consistent feedback. The interest was so large that the session had to be moved from the break out room to the ball room. Most everybody was in support, not one negative comment! Kudos to excellent work by Graham Wright and a clearly laid out and scientifically founded argument by the tech committee.

And last but not least thanks to the PHAUS San Francisco chapter and John Sarter and Lizzie Adams from PHCA for helping to organize a fantastic tour of project on a beautiful Sunday in paradise: From multiuse building to state of the art office building to residential retrofit projects, it was great!

Thank you all for coming, for your contributions, participation and feedback on what to do better next year. Keep it coming so that the next act will be better yet again… see you in Chicago, details to come!

 

 

 

 

California here we come!

I’m just back from San Francisco where I spent five days to meet with stakeholders and contributors to discuss plans for the conference coming up on September 10-14, 2014.

The talks were amazing and super encouraging! PHIUS+ projects in the Bay Area are exceptional – they all are also zero energy or positive energy buildings highlighting that passive building is the ideal starting point for going zero or positive. This growing trend – passive to positive energy — will be one of the major themes for conference sessions!

Combining passive design in buildings plus renewables is one of the strategies identified by carbon reduction groups to help mitigate and adapt to climate change. The latter because passive buildings are especially resilient in weather extremes and power outages.

San Francisco has long been aiming at carbon zero goals by 2020, looking to identify a clear set of tools on how to practically and cost effectively implement them. That’s why we chose San Francisco for this 9th Annual North American Passive House Conference. We think it can be the catalyst for a tipping point, a special moment in time when the concept is catapulted forward thanks to favorable factors in the Bay Area. With plenty of high quality high-performance projects designed and built by the pioneers in the passive community, we have an excellent opportunity to make the case to make to the city and its residents that passive design is the best path to their goals.

On my trip I have spoken with various stakeholders and thought leaders and have seen nothing but honest excitement about the possibilities of the conferencce. And better yet, if San Francisco get’s it, you know that the rest of the state and then the country will eventually follow, hence it is critical to make this a big success that radiates beyond the borders of California setting a definite sign: we are in the transition toward a new energy economy and buildings, passive and renewables will play an important role in it.

We’re excited that William Rose, a building science pioneer, will deliver our keynote and that Achilles Karagiozis, Director of Building Science for Owens Corning and WUFI developer will speak at the closing plenary. Also: Joe Lstiburek will present a daylong workshop on building science fundamentals during pre-conference sessions.

Of course, success of the conference – as always –will depend on the dedicated members of our community. We’ve collected dozens and dozens of terrific presentation proposals (and we’re a week or two behind in our review, please accept our apologies; we’ll be in touch soon), and the content of our breakouts will be terrific, as always. We also have a great range of pre-conference sessions (which als earn CPHC CEUs), including a daylong session with five CPHCs who are leading the way in multifamily builldings. Visit the conference website often for updates.

And if you’re available to volunteer to help, email conference@passivehouse.us with your availability and any special expertise. We could use help with everything from registration desk staffing to videography.

Full schedule — and more announcements on some great presenters — are on the way, stay tuned!

Katrin

 

 

PHNW5 conference: Congratulations on a very impressive event!

The Pacific Northwest Passive House community is the oldest and largest in the country and consequently leads the nation in built, certified projects.  The progress is amazing: When I keynoted the very first PHNW meeting in Olympia, there were about a 100 people, a handful of exhibitors. The number and quantity of presentations and exhibits last week at this year’s even was breathtaking.

PHIUS first brought its CPHC training programs to Portland and Seattle in 2009. Today, of more than 1500 professionals who have taken PHIUS CPHC or Builder training, approximately 300 reside in the Northwest.

Two builders/CPHCs are among those who helped lead the way by building spec projects: Blake Bilyeu’s and his dad’s project in Salem, Ore. (The Rue-Evans House), and  Dan Whitmore’s first passive house project in Seattle. Rob Hawthorne, too, has played a leading role with his Corehaus (which was on the projects tour at the 5th Annual North American Passive House conference, along with Blake’s), Trekhaus and 02Haus. Many, many have joined them. What a success story for the PHNW and the entire PH community!  That’s why I’m giving them a shout out—and I hope my good readers will pass along word of all the good work.

It was gratifying to see that most presented projects at PHNW had been designed, consulted on, built by or rated through PHIUS CPHCs, PHIUS Certified Builders and/or PHIUS+ raters. Nearly all projects put a premium on rigorous third party quality assurance and went with the PHIUS+ Certification program. Thank you for your vote of confidence and continued support of PHIUS. It is much appreciated.

Now, to some conference highlights: Kudos to the Stellar Apartments in Eugene, Ore., the very first PHIUS+ Certified affordable multifamily project! Stellar received PHIUS+ certification in 2013. What a milestone! Congratulations go to Jan Fillinger and Win Swafford as the lead CPHCs/architects on the project and Peter Reppe, also a CPHC, who designed the mechanical system.  University of Oregon Professor Alison Kwok—a former PHIUS board member and a CPHC, and her students pushed the research envelope and presented a detailed study of  measured results of the fully occupied apartments since last September. The developer had decided to build side-by-side examples of the same project: One is built to passive standards, one to Earth Advantage/Energy Star. The student team compared the results of the two test buildings, an excellent comparative study. Stay tuned for final results! I am sure we are going to see a great paper come out of these efforts.

Another highlight: The 19 unit Kiln Apartments in Portland is almost completed and awaiting final PHIUS+ certification. David Posada, who was in the very first CPHC class in Portland, approached me at the 3rdPHNW conference and told me about this multifamily project he wanted to pitch. Thanks to his persistence, it became real. PHIUS stayed involved with David through the PHIUS+ certification process and onsite verification by our PHIUS+ Raters and CPHCs in Portland, Skylar Swinford and Ryan Shanahan.

Skylar and Ryan presented on their quality assurance experience with this project. I was fortunate enough to get a spot on the tour, the only one for which this project is ever going to open its doors for, on Saturday. Truly a pleasure! Thank you, David, for moving this pioneering project forward. I can already see the ripple effect elsewhere in the country. Thank you, Skylar and Ryan, the extremely talented rater team pioneering the onsite verification, and of course also thank you to the architects on this project. It is an exceptionally handsome and exciting building!

The educational content of the conference was on par with the quality of PHIUS annual North American Passive House Conferences: the Northwest was not afraid of the most recent discussions in the field.

PHIUS is proud to note that PHIUS trainers, tech committee and board members Prudence Ferreira, Adam Cohen, Thorsten Chlupp and Chris Benedict presented 4 workshops during the pre-conference program. Prudence covered WUFI dynamic modeling, Chris reviewed multi-family Brooklyn and Manhattan (Chris’s project is also awaiting final PHIUS+ certification and was quality assured through Terry Brennan). Thorsten Chlupp’s presented his invaluable experience from the very cold climate in Alaska. Adam shared his extensive design build experience highlighting the business side of things and commercial projects, also PHIUS+ quality assured.

During the core conference Prudence spoke on the advantages of the WUFI Passive modeling tool. Graham Wright, board member of the PHNW and PHIUS senior scientist, presented on the current standard adaptation status by PHIUS and Building Science Corporation.

Special compliments go to Dan Whitmore, PHIUS certified builder/CPHC trainer and board member of PHNW: He was very much involved in putting together the schedule and presentations. Great work!

Again, it was a pleasure to be there, seeing so many friends and familiar faces. The progress is stunning and will hopefully inspire many all over the United States to follow in your footsteps!

Kat

 

Looking back and ahead at passive building

Today PHIUS delivers its CPHC training virtually and and across the country, and in partnership with organizations like Yestermorrow and the U.S. Army Corps of Engineers. It all started with the first class in Urbana, Ill., in 2008, pictured above. Bottom row, from l-r:  John Essig, Dave Brach, Mary Graham, Katrin Klingenberg, Laura Briggs, Jonah Stanford. Second row: Christina Snyder, Luis Martinez, Jim Olson, Lance Wright, Paul Eldrenkamp, Hayden Robinson, Henry Gifford, David White, Graham Irwin. Back row: Katia Sussman, Tim Moran, Ian Schnack, Al Hothan, John Highland, Gino Mazzaferro, Mark Hoberecht, Ed Shank, Bogdan Zagorowski, Jesper Kruse, Steve Robinson, Matt Howard, Tim Eian, Harold Finigan, Vahid Mojarrab, Tad Everhart, Marc Rosenbaum

I wrote in my last post about how my diagnosis with MS motivated me to rebalance my lifestyle and nutrition. One other positive by-product has been an opportunity to reflect. Once again, reflection and mindfulness – like good nutrition – have always been a goal. But the MS forced the issue by slowing me down (at least for awhile).

And I was reminded of what a rich and wonderful journey it’s been, and how far we’ve come together.

When I set out a dozen years ago, it was not simply to advance passive house principles. It was to help shrink our carbon footprint—and the effects of climate change. Passive building seemed then as it does now to be a critical part of the solution.

I started by building my own residence in Urbana, Ill. Then Mike Kernagis joined me as construction manager on two affordable passive houses built in partnership with the City of Urbana. One other affordable home was built in 2011, and we designed three private homes. And, the Solar Decathlon Home 2009 came home from D.C. after placing second, bringing the number of passive homes in the Champaign-Urbana area to eight.

The reaction — from points far and wide across the country was — so strong and positive that we assembled the first English language CPHC (Certified Passive House Consultant) training program in 2008.

It’s been a whirlwind since then. In 2009 we founded the Passive House Alliance US (PHAUS) and communities of our trainees coalesced in their respective regions, forming groups such as PHCA, PHNW, NYPH and PHNE. PHAUS, a PHIUS program, has added more than a dozen chapters under the PHAUS umbrella nationwide.

Most important, we deliver the training nationally and virtually now, and the community of PHIUS-trained CPHCs (now 550+ strong) started building real, successful projects across North America’s climate zones. Some of the bleeding edge heroes of the effort include Dan Whitmore, Jan Fillinger, Win Swafford, Tad Everhart, Blake Bilyeu, Randy Foster and Tessa Smith, Alex Boetzel and Stephan Aiguier, Rob Hawthorne, Margo Rettig, Jesse Thomas, Joe Giampietro, Graham Wright and Sam Hagerman in the Northwest. In the Bay Area, the torch was carried by Allen Gilliland (the first NZE home in Calif.), Graham Irwin, Rick Milburn, Nabih Tahan, Lowell Moulton, Katy Hollbacher and Prudence Ferreira.

The Northeast honor roll: Laura Briggs, Paul Eldrenkamp, Marc Rosenbaum, Peter Schneider and J.B. Clancy, Mike Duclos and Paul Panish, Alan Gibson and Matt O’Malia, Svea Tullberg, Jesper Kruse, Stephanie Bassler, Jesse Thompson, Laura Blau, Tim McDonald, Chris Benedict and Henry Gifford, Dennis Wedlick, David White, Ken Levenson, Jordan Goldman and Stephanie Horowitz, Andreas Benzing, Julie Torres-Moskovitz.

David Peabody, Adam Cohen, John Semmelhack, Michael Hindle, Barbara Gehrung, Alan Abrams and Dan Levy have led the way in the Mid-Atlantic region; Chris Senior, Clarke Snell and Jeff Buscher in the Carolinas; Ed Shank and Mark Hoberecht, Eric Lang, Pat Murphy, Mary Rogero and Faith Morgan in Ohio.

In Kentucky, Ginger Watkins and Michael Hughes have been leaders; way up North Stephan Tanner, Tim Eian, Carly Colson, Rachel Wagner and Mike LeBeau carried the banner. Lance Wright and Brian Fuentes sparked the community in Colorado; Joaquin Karcher and Jonah Stanford in New Mexico; Dave Brach in Salt Lake; Vic Weber in Idaho; Ross Elliott and Natalie Leonard in Canada; Thorsten Chlupp in Alaska: Linda Metropulos, Laura Nettleton and Michael Whartnaby in Pennsylvania; Tom Bassett-Dilley, Mark Miller and Patrick Danaher in Chicago. Finally, Dave Stecher, Dylan Lamar (who also did the first IP version of PHPP while at PHIUS, a critical step), Ian Schnack, Ryan Abendroth and Darcy Bean helped blaze trails back at home in Urbana, and later on their own in Phoenix, St.Louis, Portland Ore. and Pittsburgh. Pa.

There are more—like Corey Saft who had the gumption to build a passive house in Louisiana. We learned so much from that project. Surely I am omitting people – I apologize for any memory lapse. The point is, there’s no substitute for all of your commitment. I feel privileged to be part of your community.

We are headed toward our 9th Annual Conference, and today, in addition to CPHC training, we offer PHIUS Certified Builders Training, and a PHIUS+ Rater training that enables HERS raters to accurately rate passive houses. These programs are relatively new, but the Certified Builder program is always sold out and already the community of PHIUS Certified Builders is approaching 100; and the Rater community is right behind it.

We’ve forged strategic partnerships with the likes of the U.S. DOE, Building Science Corporation, RESNET, Rocky Mountain Institute. We’ve also established  relationships with the prestigious Fraunhofer IBP, Owens Corning and Oak Ridge National Lab—a partnership that produced WUFI Passive. WUFI Passive is a fantastic software modeling tool that is making passive energy modeling easier, more accurate, and integrated with WUFI hygrothermal analysis. It’s a commercial grade software tool with a streamlined GUI and the most powerful passive and hygrothermal modeling capabilities on the market. It is, simply, a leap forward.

Looking back, I see there was another critical group—and I mean critical. Let’s call them the passive house skeptics. They’ve ranged from Marc Rosenbaum to Joe Lstiburek to Martin Holladay.

When I set out to prove passive house principles in the United States, I was energetic, armed with information from the German PHI, and … a little naïve. Passivhaus was new to me and the majority of people I talked to about it. And I thought—like a lot of like-minded people—that I’d discovered something brand new.

After I built my own passive house in 2002, and we started getting some attention in the mainstream and trade press, I began hearing from energy conservation pioneers. On one hand, they were excited to see conservation back on the front burner, after interest in it trailed off back in the 80s.

But some were also a bit miffed. I didn’t understand it at the time – and misunderstood it as resistance to change. It was quite the opposite. It was the notion that this passivhaus or passive house was new that was irksome to them.

Indeed, I learned that the foundation principles that distinguished what I called passive house in English or passivhaus in German were not at all new. Superinsulation, high-performance doors and windows, removing thermal bridges, energy recovery ventilation/minimizing mechanicals, managing solar gain. A group of pioneers — including some in my own backyard in Urbana at the University of Illinois—had formulated these concepts decades earlier.

What we have learned – and I say we because we’ve learned it side-by-side with CPHCs and builders who’ve faced real-world challenges across climates—is that this group of early pioneers had valid misgivings about passive house as formulated in Europe. The concerns included the small-house penalty, North American issues with latent humidity, and the cost-effectiveness of investing in the envelope as opposed to renewables. The biggest concern: deep disagreement that a single numerical standard for all climate zones could make sense.

Reasonable people can and will disagree. But on the single standard, we at PHIUS have come to agree that a one-size-fits-all-climates standard is flawed, and is a major factor holding back adoption. I, like a lot of people, found the notion that a single number could work for all climates magnetically attractive. But in our experience designing, building, certifying and monitoring, we’ve concluded it doesn’t work. That’s an important departure, but not a disagreement about passive house principles being the best place to start for high performance building.

That’s why we’re engaged with Building Science Corporation in testing climate-specific standards that use the peak load calculation (which underlies also the European standard) as a baseline. (BTW, again—climate-specific doesn’t necessarily mean “easier.” In some climate zones, we expect the standard to tighten.)

Now, make no mistake: When interest in conservation waned in the United States and Canada in the 80s, the efforts of Drs. Bo Adamson and Wolfgang Feist to formulate passive principles for Europe were heroic, and Dr. Feist’s continuing efforts with PHI have been invaluable. In particular the PHPP was an important step toward putting modeling within reach of passive house professionals. We owe them gratitude. But the work of our entire community, the advancement of building science and innovation must quite naturally go on. There is no holy grail here.

Some lament the differences that exist within the passive building community. To be sure, some of the harsh rhetoric and hurt feelings have been regrettable (and, I think, entirely avoidable moving forward). But we see different and competing ideas as healthy and necessary. It’s only natural that as a community grows, it grows more vital and diverse, and that competing views—and to be sure, competing interests—arise.

The entire passive house community, regardless of scientific position or organizational loyalties, is pulling toward conserving energy and reducing carbon emissions, while constructing extremely comfortable, healthy and resilient buildings. And we agree that passive is a great way to do that. But honest competition has always driven growth and innovation. Trying to put a lid on ideas suppresses growth, and leaves us fighting over a very small pie.

Here’s to a vibrant and diverse passive house community, and to a much, much larger pie!

Katrin