So this year we were fortunate enough to expect unexpectedly fat checks back from the feds and the state. My wife and I have decided that the smartest thing to do with the cash (around $3K) is to invest in green energy improvements. We sat down the other night and came up with a list. We have already put down all the insulation possible in the attic, so that isn't in the list. So here is the list, with major considerations in parenthesis: - Solar panels for DHW, problem is house doesn't face south. - Replace uninsulated curtains with cellular shades - Whole house fan and more attic ventilation - Down payment on hybrid (a big albatross of a loan on our heads for the next few years) - Two wheeler scooter to use instead of car for small errands (useless in winter). - Skylight (or tube skylight) in hallway where it often gets dark and we turn on lights unnecessarily - Get a solar cooker and use it instead of grill - Add a south facing family room and put the solar panels on that, and room for a dhw tank which will do away with the tankless coil altogether (another albatross of a loan on our heads probably for as long as we own the house.) Any opinions from others on which might provide a good bang for the buck? I have a 1200sf ranch house on a slab, radiant under slab heat via oil boiler, tankless dhw coil, and a Lopi Answer woodburning insert (which easily keeps the house at 70+ by itself even on cold days.) House faces east-west.