"I don't think anyone can dispute the fact that the roof would be cooler, although putting a number on it would be difficult.
As far as using it to lower the cooling load and therefore the KWH, in my opinion would be risky and unwarranted.…"
"The IECC code states that the area between a drop ceiling and roof is considered as unconditioned.
I don't know why it would be unfeasible to test the ducts, and I'm not sure of the parameters of why they would be tested. Is someone saying…"
"Interesting observation. It sounds like your a good Home inspector.
It seems to me like the air movement is the from the latter. The air is moving through the wall assembly caused by the Delta-P, and it is showing up where the…"
"If the attic is vented to treat it as an exterior wall, if not vented then its adjacent to an unconditioned space. Just determine the sf and U-valve. As far as infiltration, if you can't do a blower door that's fine, if not try to…"
The mini-split systems now have options for the on-wall units. Its the major issue with clients. They have several options, including ducted ones, and even one that looks like a steam radiator.
Check them out.
As for the duct leakage, you…"
"Yes, its a Hydro-air system. It uses one boiler to supply hot water to the coil in the supply side like you mentioned. The reason for this system is to allow multiple A/C zoned systems without adding a whole Heating/cooling system.
One boiler can…"
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