I live in a little underground apartment. It's not very big, but it's not too small either. The problem is that it's heated by electric heat. My electric bills are starting to get a bit crazy now that it's gotten colder, so I'm looking to see if anyone has any tips to keep it warmer! I have to keep the heat at a minimum of 68 degrees. I can't turn it down when I leave, otherwise there's a high chance my animals will die. If I could find a cheap replacement to heat their cages (one glass and one plastic) while still providing air flow, I'd gladly turn the heat down.I have the closet closed unless I need in there, and the bedroom stays closed except for the 2 hours before bed when I try to warm it up.I've also put up some carpet "samples" over the extra door that goes to outside - which I don't need to use - to help keep the cold out.The other door going to the outside is raised up about 2 inches from the floor. I put some more carpet samples in front of it, but I haven't been able to find anything better to block it off while I'm away - which is quite often. Does anyone have any other tips for cutting back on heating costs? Note: I don't have any other troubles with electric other than for heat. I've already lowered that consumption to the minimum.