Elizabetty's Profile

Another vote for wall and ceiling insulation, since those take up so much more surface area than do windows. I've had cellulose insulation blown in to walls and ceilings of exposed rooms and the temperature difference was amazing - like covering your apartment in a toasty blanket. Good news is that there are tax credits available for the work and that it's very green (cellulose is just shredded newspaper + minimal fireproofing). Bad news is that the work entails the contractor punching holes in the walls/ceiling in between beams, so effectively requires a spackle and paint job.