Can anyone comment on the common types of heating and cooling systems installed in their region in high performance homes? More and more, I see designers and builders turning away from forced air…Continue
"I would look into reports from the 1980s by Sheltaire Scientific for the CMHC. Here's an example for testing procedures to use multiple blower doors to characterize attic ventilation leakage areas. Also, check out this LBNL…"
"What about a hot water plumbing leak? I would expect on the order of 5,000 kWh per year with typical usage on an electric tank water heater. But if there's a plumbing leak, then who knows...Also check for hidden electric resistance heat, in…"
I'm assuming you're trying to predict the airflows through the different openings W1, ... ? It is very unclear from the drawing. You're probably aware, but solving the problem requires calculating the pressure…"
"Here's a link to a presentation given to summarize the work. Some of it is a bit dense, fair warning. Focus on the table on page 32, figure on page 35, page 42 and the Key Results slides 45-47. Notable info, the supply ventilation with MERV 13…"
"Bruce, If you like, I can share some results from a recent ARB study we performed testing the effectiveness of a variety of filtration systems in a test home in a Sac suburb. Basic summary, whole house filtration, driven by a continuous fan (or…"
"Anyone interested in this realm should check out the EPA-funded project at the South Coast Air Quality Management District for comparing the accuracy of low-cost air quality sensors against reference equipment. Results are HIGHLY variable and…"
"Duct surface area clearly gives the more precise assessment of the quality of the installed duct system. But that precision is only precise in appearance, due to the difficulties of getting the correct surface area number. This is similar to blower…"
"In case this is useful for anyone, I have calculated the 2010 carbon emissions per unit of delivered electricity (lbs./kWh) for each state in the U.S. (based on eGRID data). The map below of the US highlights states where a best-in-class…"
"Thanks Bud. I just feel the need to point out any such issues, because we as a field need to be inclusive of women, both as home performance professionals and as homeowners (and elsewhere). I understand that it was not your intention, I'm…"
"I would love to see such matters discussed on this forum without broadly characterizing women as weak and irrational.
As for the other benefit of air sealing, it is certainly something that home/pest inspectors regularly recommend to limit pest…"
"I recently was working on a project, dominated by men, in which one woman was a contributor. Now, I'm not privy to all the details, but at some point, I noticed that the email string no longer included her. I brought this up casually by email,…"
"William, maybe I miscommunicated. In my personal experience (largely in the Bay Area PH projects), as well as from my observations from the larger PH community of homes (presentations on the topic by Katrin and W. Feist), the most common kitchen…"
As an LBNL building scientist who studies deep retrofits, I can confidently tell you that (1) airtightness matters, even in Berkeley, and (2) that it is very unlikely to make a home uncomfortable (assuming you provide ventilation and…"
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