Solar panels and wind turbines get all the attention, but an underappreciated device is helping slash emissions in a big way: the heat pump. Instead of generating heat by burning natural gas, like a furnace does, an electric heat pump extracts warmth from outdoor air and transfers it inside. In the summer the device reverses, pumping indoor heat out to cool the building.
Sales of heat pumps are booming all over the world; some 4 million were installed in the US in 2021, up from 1.7 million in 2012. The US Department of Energy is hoping to juice those numbers even more, with an
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