The fan cools the attic and ceilings when outside temperatures are high, while the heat fan shuttles warm air from ... x 8' board (solar sheathing), $4,000 (new roof), $600 (whole-house fan ...

Essentially, it allows the water heater to get much hotter during times when solar energy is available, and lets it drop to lower values before running the heater on utility electricity during ...

Paxos Solar unveiled a glass-glass tile that can connect to a heat pump on a house, powering the system ... "water-bearing ...