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Heat pumps twice as efficient as fossil fuel systems in cold weather, study finds
(www.theguardian.com)
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this post was submitted on 12 Sep 2023
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Technology
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A sticking point I encountered - the drop in efficiency as the weather gets colder means you need a unit sized to heat your home on the coldest days you expect to encounter. So you need to buy a heat pump that's larger than you need for 98% of the year just so you don't freeze that other 2%. In addition to higher cost an oversized unit is less efficient because it's cycling more.
So this is where "heating strips" or "backup heating" come in, and then I get we've come full-circle.
The optimal solution is to add a small heatpump in addition to a gas heating