> Contrary to popular belief, modern cold-climate heat pumps can heat a home efficiently even when the temperature drops below -10 degrees. At this temperature the best cold climate heat pumps are still more energy efficient than furnaces and boilers
This is maybe true if your house is insulated to Scandinavian standards. Our heat pumps here in Maryland get iffy around 20 degrees in our circa 2005 house. We have a nice oil burner heating a hydronic system that does a great job at that point.
Having a heat pump transfer the energy to heating water that is then circulated in radiators is becoming quite common in the Nordics, and often used as a replacement for an oil burner. It's more efficient than a regular heat pump that just uses hot air to warm the home.
Of course dealing with crappy insulation can often be more bang for buck.
If you believe lack of insulation is the problem, the heat pump is just underpowered. A more suitable model or, even better, adequate insulation, would likely be a triple win financially, environmentally, and for your and your neighbors' health.
This is maybe true if your house is insulated to Scandinavian standards. Our heat pumps here in Maryland get iffy around 20 degrees in our circa 2005 house. We have a nice oil burner heating a hydronic system that does a great job at that point.
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