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Heat Pump in Seattle--Do I need backup heat?

5 months ago

Our gas furnace died yesterday, accelerating our plans to upgrade to a heat pump. Probably going with a Mitsubishi system. But, I just finished talking to a guy who installs Daiken systems. He insists we have to have backup heat, that we will need backup heat whenever temps get 30F or less, and that heat pumps barely work at all under 15F, as the outside air is too try for effective heat transfer. Is any of that true? Do I definitely want backup heat, or can we get by with a heat pump and space heaters for the 3 days a year the temp gets under 30F? We live in a suburb on the east side of Seattle, with winter temps 5-10 degrees warmer than Seattle temps.

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