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Dec 1, 2016, 5:01 am190 pts
Grist
Q. Dear Umbra, I want to replace my aging gas furnace with a heat pump. But the heat pump is much more expensive than a high-efficiency gas furnace, and I’m only gonna spend the money if it cuts down on greenhouse gas emissions. And heat pumps use HFCs, which are potent greenhouse gases themselves, and some…
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