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by tomatocracy 2307 days ago
This is true but - especially if your house is not well insulated - getting heat in the right place matters too - most people don't need to heat their roofs or ceiling spaces. There's also a more minor point on time of day you want heat or not.
1 comments

Well, hot air tends to rise anyway.

Anyway, my point is that the inefficiency lost to "waste heat" is not 100% waste.