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@saidsoftly@retro.social I don't think it's marginal, though! Certainly not in an attic.
Assuming zero leaks (which, good luck with that) you're running a lot of air through a tube with maybe R13 insulation, and that tube happens to run through a 140° space.
Or, you could run it all below a ceiling with R50 insulation, eliminate the temperature gradient, and leaks don't matter anymore.
This article claims 25% losses on the low end.
@saidsoftly@retro.social Now, is that article correct? I dunno! But even if you can save just 10% on your cooling bill, when you're looking at building a new home, what I'd call proper ducting might add 10 to 15 dollars to a monthly mortgage.
That's money well spent as far as I'm concerned. Imagine how much less strained the Texas grid would be if they just built their homes like we do up here!
@TechConnectify @saidsoftly I was wondering about this, so I the data I got on the last super hot day we had in Austin: September 7, 2023.
Output air temp comes from the ducting after running through the crawlspace.
My first glance makes me think temps in the attic maybe cause a 5F change in air output temp 59F vs 64F.
I need a thermometer in the attic and one the upstairs room that doesn't have a portable AC.
