I'm a big advocate of getting ducts inside the building enclosure. In cooling climates, getting ducts out of an unconditioned attic can save you 15% on your electricity bills. It can reduce the size of air conditioner you need by…
Duct leakage testing has come a long way. We've gone from doing the subtraction method with blower doors to having specialized duct pressurization blowers. We've also evolved in how we seal the ducts for a test, going from kraft paper/masking…
Dr. Joe Lstiburek of Building Science Corporation is on a mission. The issue is residential ventilation. He contends that the residential ventilation standard, ASHRAE 62.2, ventilates at too high a rate, causing problems with humidity in hot or mixed humid…
I see people misrepresenting programmable thermostat concepts all the time, so let's set the record straight here and now. Yes, when you set the thermostat back so your air conditioner or heating system doesn't run as much, you can save…
Rather than blowing agents, this insulation uses growing agents. It's natural. It's made with agricultural waste and fungi. You can grow it in place. No hydrocarbons are involved, and it yields little to no toxic waste. Compared to most other…
Learning building science—or anything really—takes determination. My friend Jay always tells people when he's teaching them to juggle that picking up that skill takes only two things: wanting to do it and spending time practicing. Learning building science—or anything really—takes…
You can install a radon vent the hard way. Or you can install one the easy way. I discovered in Nashville a couple of weeks ago that home builders there prefer to do it the easy way. That is, they…
"ASHRAE 62 is the only national consensus standard document there is. Follow 62.2. Resistance is futile." So said Dr. Max Sherman last summer in a presentation for the Building America Technical Update meeting. (Download pdf official report here.) That statement…
"A New Zealand technician got fire balled in the face," a member of the HVAC-talk.com forum stated bluntly. He was referring to a case where an HVAC tech got burned when he thought he was working on a system with…
Guest post by Leigha Dickens, Green Building Coordinator for Deltec Homes, who earlier this year was a student in our home energy rater class. Guest post by Leigha Dickens, Green Building Coordinator for Deltec Homes, who earlier this year was…