Individual solar panels come in a lot of different shapes and sizes, but generally speaking, they're about 3 feet by 5 feet, or about 15 square feet per panel, according to Pamela Frank ...

In March, we removed the 4-kW solar array as well as the existing ... Cost: $300 (attic insulation), $23 per 4' x 8' board (solar sheathing), $4,000 (new roof), $600 (whole-house fan), $570 ...