I think what pit was meaning is that it is perhaps not a doable method in each home. For example: I have an older oil heater in a large room. During the height of winter 82 is generally the warmest temp that my room will make it to due to the size of the room and strength of the heater. I still have to run heat tape because of this. Ambient temps do not currently work in my home as the sole source of heat.

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