Some of the solar fans for our sqft were about 4-500 dollars, not the kind sold at home depot. I'm going to look further as well into the ridge vents to be sure mine are adequate. The radiant barrier also intrigues me and thinking of getting one of the free quotes. The "energy savers" will be my only indoor mods as I want to finish the curb appeal of the home first and do the spit level yard in back. I looked at solar panels and even contemplated that with the free home estimates. I'm just scared to see how many zeros follow the quote, even though there is an alleged 60-70% rebate, lol. Although, home depot has a similar program, they instantly apply the rebates. Thinking of trying both companies out for estimates to see who will be playing the numbers game. Kind of like making the mistake of telling the car salesmans how much you'd like to pay a month.