I'll have to check the window seals, etc. extremely well and maybe call Kermit. There must be something wrong with our emergency window. Last night we slept with one space heater on between the beds and the privacy curtain closed (as we've done in the past but maybe not when it dropped so low outside). We have the truck vents off and the drape across the bottom half of the cab as I mentioned in an earlier post. When I got up it was tolerable (but still quite cold) in the bedroom area but our weather station showed 20 degrees outside and 40 degrees inside the kitchen/living area of the coach. With two space heaters (or for awhile one heater and the heat strip) we got it up to 58 after about 2.5 hours. We are leaving both heaters running tonight just to have a warmer base temperature to start with in the morning. We went back to the space heaters because the heat strip tends to blow right to the cab area and stirred up all that very cold air I had trapped behind the half curtain and actually dropped the inside temp for awhile. We dragged one heater out of storage and it is old and not as energy efficient so we have to run them on low to avoid tripping our power. We also have the computers on, tank heaters, cat's bed warmer (she's 18, she needs it), etc. so we are probably maxing the power. The coach is finally warm so we plan to keep both heaters running all night (with them cycling off when they reach their set temp). Fixing that window and blocking the cab should put us back to snug and warm - just in time for spring to arrive! (which is pretty much on schedule with getting the furnace fixed too).