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3799 Main St. #87024
Atlanta, GA 30337


Advanced residential construction and home improvement consulting and owner's advocacy in Atlanta, using the latest building performance diagnostic and modeling techniques and tools. Airtightness, insulation, HVAC, ventilation, moisture, and air quality and EMF consulting for homeowners and building professionals alike.


Home performance articles and stories from the field with internationally respected building forensics guru Corbett Lunsford at the Building Performance Workshop. Hear new episodes of the Building Performance Podcast, see new videos from the Home Performance YouTube channel, and learn all about how diagnostic testing (more than an 'Energy Audit') can make home improvement and new home construction a proven process!

How to Teach Builders about Home Performance

Corbett Lunsford

Corbett presented for Broan-Nutone and Fantech at the International Builders Show (IBS) 2018 in Orlando, and in case you weren't there, here it is! Learn all about why builders, manufacturers, contractors, insulators, HVAC techs, and others in the construction industry are starting to care about, and act upon, the metrics that come from home performance testing.

Thanks as always to the sponsors who are leading the charge in making measured performance mainstream with 'Home Diagnosis' coming to TV screens soon! 

How to Teach Home Performance to Home Owners

Corbett Lunsford

See how Corbett teaches home performance to the uninitiated after having given this presentation 214 times across the U.S. on the Proof Is Possible Tour. Special thanks to the tool companies and all other sponsors of the upcoming TV series 'Home Diagnosis' who have invested in making home performance a mainstream topic:

Most Airtight Barn at an Off Grid Homestead Ever?

Corbett Lunsford

Corbett performs a blower door test on LG Squared Architecture's #OffGridHomestead. Will Chris's toolshed beat the record set by the #DryVault? Will Passive House standards be outperformed? Will Corbett remember to plug in all his hoses?

Tour the Off Grid Homestead with Chris Laumer-Giddens

Corbett Lunsford

Last week I made my first site visit to the mountains of North Carolina to start performance testing the #OffGridHomestead. This is an uber-homebuild with LG Squared Architects (now also LG Cubed Builders) and Chris Laumer-Giddens has a lot to show us, even at this rough in stage, with saws running and tractors rumbling around.

DEAR CORBETT: Multifamily Blower Door Testing Nuances

Corbett Lunsford

Good day Corbett,

I wanted to let you know, that I really enjoy your approach to the whole building science and your building performance workshop website. I am relatively new as a Resnet Rater and the county where I live is Collier County in Florida.

They recently adopted the new code standard set by the state. My question relates to multifamily condo units. I have a client that did renovations to a 2,500 sq. ft. penthouse condo and the front door to the unit is I a common area. The county wants them to perform a blower door test in order to obtain their certificate of occupancy.

I realize this would be a compartmentalize test, since I can only have access to the unit they renovated for their client. Knowing that I will encounter not only leakage to outside but also internal leakage between units. I was wondering what the best approach would be to ensure a successful test. Collier County requires between 3 ach and 7 ach for a test to pass code.

Any information would be appreciated. Thanking you in advance.

Best Regards,
Norm Giguere

Dear Norm-

Thanks for your question, it's a good one! First off, you should be fine if they did a good job with the renovations- 7 ACH50 is not terribly hard to achieve.

When you set up your blower door at the front door of the condo, you'll blow air out into the common hallway, so you want to make sure all possible windows/doors in that hallway are open to the outdoors. Use the emergency exits if necessary (make sure maintenance knows what you're up to).

You'll be testing the condo's leakage to everything outside of it, including the downstairs unit, but that's intended. They really will have air leaking between the two condos, if there are leakage pathways, and you want to be testing for that and including it in your blower door test result.

Ask your code official if they want the result to pass the residential code or commercial code, because you have to test at 75 Pa in commercial. I always advise doing a multipoint test (get the flows on at least two pressures, like 25 Pa and 50 Pa) so you can extrapolate the 75 Pa if anyone ever wants it in the future. Saves you a trip.

AS AN ADDED BONUS, consider doing a Zonal Pressure Test on the unit downstairs, to see how much the blower door is affecting it. Always nice to have more data than you need.

Happy Testing,

2 Years Later: is #TinyLab Still the Highest Performance Tiny House on Wheels?

Corbett Lunsford

Grace and Corbett built the world's highest performance tiny house on wheels in 2016. It was perfect. Then they toured it 13,000 miles across America and let 7,000 people come inside to feel, hear, and smell what perfectly tuned home performance is like.

What's the house performing like now, after all that torture? And under 2 inches of snow in Atlanta, Georgia? See for yourself in this 20-minute tour, complete with testing, demonstrations, and metrics that show Proof Is Possible, even for people who have never built a house before. The #TinyLab is still the undisputed most scientifically superior home performance demonstration in the world, and we sincerely hope others start challenging our work!

First Five Sponsors of First-Ever Home Performance TV Show Recognized

Corbett Lunsford

BIG THANKS to the first five companies to put their money where their mouth is! These teams are investing in the future of home performance in mainstream America through the first TV show about a scientific approach to homebuilding and home improvement: Home Diagnosis!


Trutech Tools:
475 High Performance Building Supply:
HVAC School:
CPS Products:

Ventilation Innovations at IBS 2018

Corbett Lunsford

Phil Rivas of Fantech shows Corbett around the Fantech booth at the International Builders Show 2018. Demonstrations of Inline Kitchen Exhaust hood with silencer, Energy Recovery Ventilator with balancing registers, HEPA filtration, and Dryer Booster Fans. Learn more at

Testing the World's Worst Duct System

Corbett Lunsford

I'd love to show you this, but my client has asked that I take this video down while they try to reconcile with the installer. Fingers crossed everybody, and sorry to be a tease.

Podcast #83 Affordable Housing That Kicks McMansions' Butts with Bill Lazar

Corbett Lunsford

Today Corbett talks with Bill Lazar of St. Johns Housing Partnership about how his organization built hundreds of affordable homes in St. Augustine, Florida, that are scientifically superior to the million dollar mansions going up across town. Recorded from the #TinyLab on the Proof Is Possible Tour.

Giving Back with Home Performance: Temporary Housing for Homeless Women & Children

Corbett Lunsford

Corbett sits down with Kathy Swahn, award-winning director of The Drake House, which provides temporary housing for homeless women and children in Atlanta. Reportedly, the average age for homeless people in Atlanta is 9 years old- whoa.

Review: EasyHood HVAC Diagnostic Tool $400

Corbett Lunsford

Corbett likes tools that are sexy and scary at the same time. This flow hood is both. Measure CFM, Drybulb, Wetbulb, Dewpoint, Velocity, and more with this very affordable tool that will help revolutionize the HVAC industry.