My home office is in a refurbished room of the house. Just looking at it, you can tell that it clearly used to be screened-in porch, that was later turned into an additional spare room. I had always thought for the first few months that the reason it was drafty was due to all of the windows and the odd shape. It’s fairly cut off from the rest of the house, so it doesn’t get much heat from the layout. Fortunately, the room has its own HVAC zone control with even a different type of heating than the rest of the house. While the house proper runs on oil heater, the spare room runs on an electric heater system. Finally once winter gave way to spring, I decided to investigate the problem. It turns out the door was never properly sealed. We suspect it was the very same door from the original screened-in porch in the 60s. Rather than take it off and apply the gaskets, the older owners simply took some kind of industrial felt and nailed it in long strips around the edges of the door with tiny decorative nails. Like trying to put a door sock around an entire door. Now that it’s warmer, we’ve taken the whole thing off and just left the screen door shut. Rehabbing the door was really easy, we just brought it out to the driveway and followed an instructional video with parts of the hardware store. We’re hoping this simple improvement will help keep the spare room warmer this winter, and save us a few dollars on the central heater bill.