Other drawbacks include: Your air conditioner won't work at night unless it's tied to the grid or you purchase a battery pack. Solar air conditioners cost more than conventional ones. The average ...

U.S. power demand is surging as data centers plug in. The cheapest, fastest way to keep the lights on? Solar-plus-storage, not gas generation.

Cost: $300 (attic insulation), $23 per 4' x 8' board (solar sheathing), $4,000 (new roof), $600 (whole-house fan), $570 (whole-house heater), $1,450 (two skylights) After $18,500 in rebates and ...