"In Connecticut’s climate, I am not in favor of them .
Either they are the big old style that move 3-5000 cfm and are not easily insulatable, or they are newer ones that seal and are somewhat insulated, but move a lot less air.
"Morgan, From the perspective of the energy auditor, I don’t agree with that statement.
“Actual fuel and electrical usage" is anecdotal at best”
Unless you change something, the best predictor of future energy usage is past…"
The question was how to translate- from design heat loss calculated by using ACCA manual J protocol to a yearly fuel usage. I outlined a crude way to do it. Is it perfect? Nope. There are a lot of caveats to…"
As a ballpark figure, take the design heat loss and divide by design temp difference, this gives you btu’s per °F per hour. Multiply this number by 24 hours (per day) and then multiply by heating degree days to get yearly …"
"Older buildings typically are 6-15 ACH50 worst I have personally tested was 17 ach50. The energy loss scales ~ linearly with ACH50 so If you go from 17 to 1.7, the heat loss from air leakage is reduced 10 fold.…"
That is why I called out the air tightness specifically. Why stop at 0.6 ACH50? Why not 0.006 ACH50?
I will lay out my rationale for 1.5 being a good number.
Think about it this way, the OP has a 1000 SF ranch. …"
"I think in all this you are getting bogged down in the law of diminishing returns
We are talking about a small house, in a sub 3000 heating degree day climate. If we took my own house ~ 2200 sf of conditioned space, and plunked it…"
"David you are right of course- that is why I made no claims as to the accuracy, I called it a half assed plan. I don’t know Cali- at all. I have not set foot in the state in 28 years. From what I remembered it was…"
"This is my no calculations half assed energy based renovation suggestions-
First off, Berkeley is a mild climate, If I lived there I might not even bother with heating. For a small house a Minisplit heat pump system is a no brainer…"
"Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you! Don't…"
" I would cut 1 inch strips of 3/4” pine as spacers to go between rafters and use 3/8” plywood ripped to 14 ½ to create a ridged air channel from soffit to ridge vent, foamed edges to airseal.
I would add…"
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