Hello everyone and thanks in advance for any advice. My home is a single story built in 1976 and each winter my electric bills triple to the point that last year I couldn't afford to pay it each month. As far as I know, my house is well insulated. The attic has laid in not blown in insulation with no gaps however the attached garage attic is not insulated. Under the house, the crawl space is big enough to actually crawl in and the insulation is nicely fixed to the underside of the house. I did not see any gaps. I did replace half of the carpet with wood lam a few years ago and that made things colder. My windows are the brown windows common in the 70's but they are all double sliders. There are two tall skinny view windows (non sliders) but they have storm windows attached to the exterior. I have 2 sliding glass doors that seem to seal well. Last year I put thick vinyl shower curtains over all the windows and sliders but they didn't seem to help. I also put them on the outside of my bedroom window, doubled up and tacked tightly. Also did not seem to help. I turned my thermostat down to 60 degrees and wore full winter gear inside the house for 4 months. I don't want to spend another winter being cold all the time. I do have a fireplace that I only use to burn papers and old bills. The cost of firewood is more than electricity anymore and most of the heat goes up the chimney anyway. I keep the damper shut. One more thing, my house is one of only two in my neighborhood with double front doors so I think it might have been the show house originally. (The cabinets and trim are not the cheap stuff). I have had a terrible time getting a proper fit with products to insulate where the two doors come together. I have tried the stick on gray stuff and the brown vinyl strips. Any DIY help?