I have this idea, and since it seems logical to me, but I don't see it anywhere I suspect I am missing something.. so here it is:
Why not put a vent that pushes air from the attic into house?
- At summer, everyone wants to exhaust the hot attic air outside, makes sense.
- Winter time, the attic still gets hotter, quicker, on cold *sunny day then my house (because I have little direct sun into my house, but also in any well insulated house).
- why not use the greenhouse "attic" effect, and have a vent sucking the hot air from the attic into the house? you could have that fan linked to a thermostat, only pushing air when attic temp > house temp...
seems easy and cheap, what am I missing?