I agree with you Randen, because, the past two winters,
I've been watching the dew-point and the ice that builds up on the Sanyos.
It only occurs at night or early in the morning.
I've never seen a defrost cycle after the sun has been up a couple of hours.
The attic air seems to be okay to me. I've never seen any rust up there at all.
Condensation doesn't seem to be a factor in the attic.
I already own a nice differential controller. So that part would be easy.
But, the long ducting would be a problem. I've been looking for a good place
for a top-to-bottom duct, but no really good locations are jumping out at me.
Ducting for the kitchen heat stealer hack would be short and sweet..
A controlled amount of heat would be delivered where it's needed.
A top-to-bottom duct would be harder, I've been thinking that a 4" PVC
pipe driven by a 15w blower might bring down some warm air..
FanTech HP2133 Radon Mitigation Fan 134 CFM 650737021337 | eBay
Humm, pressure equalization.?. LOL! I could hook up a second HP2133 to do actual Radon mitigation,
and dump the radioactive air from my 'hot' sump hole outdoors, above the roof line. (Per code).
Right now, the hole is sealed, but Radon gas is always accumulating down there and decaying.
Might be good to move some of that gas out of the basement during the winter.
It's staying around 2.5 pCi/L, and that's well below the national action level of 4 pCi/L
But if I could get it down under 1.5 pCi/L, that would be okay.