While I admit that I did turn on the heat upstairs about 2 weeks ago I held off on the first floor since the only thing down there is the kitchen and my computer room. The 5 old CRT monitors keeps the computer room warm and the refrigerator seems to be keeping the kitchen warm. But so far today the high outside is 45 degrees and even my thick hide (and warm sweat shirt) are not cutting it. Just had to turn on the heat. Fortunately it only lasts a few months here. When people ask me about the convertible I tell them that I put the top up in November and it comes back down the middle of March. Welcome to Hillbilly Heaven!