Ian, I thought of you with the windows...
Purchasing New Windows and Doors
Before, tax credits for windows and doors were capped at $200. Now you can get up to $1,500. But that's only if those doors and windows meet certain criteria.
Windows, doors and skylights need a label from the National Fenestration Rating Council (NFRC) that says their U-factor -- a measure of how well they'll insulate the home from heat -- is no more than 0.30. The label also needs to list a Solar Heat Gain Coefficient (SHGC), which measures how much of the sun's heat penetrates into the home, of no more than 0.30.
Still, qualifying windows are expensive, with most ranging from $270 to $1,100, says Susan Roeder, spokeswoman for Andersen Windows and Doors, a window and door manufacturer based in Bayport, Minn. Doors can start at around $840 and go as high as $2,500.
Storm windows and doors can also qualify. The storm window's manufacturer certification statement lists the type of exterior windows, including single pane or clear glass, which it can be combined with to be eligible for the credit. Storm doors need to accompany a tax-credit-eligible wooden door without exceeding a combined U-factor of 0.30.