By heat pumps suck - 26/01/2017 14:28
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Speak to your landlord about your issue. Heat pumps become inefficient below 40 degrees, and don't produce much heat. When this happens, electric heating coils take up the slack and drive up your electric bill. Gas heat (and even steam/hot water with an efficient boiler) is much more economical.
Moved to the Northwest? If that is the case, 20s is not the norm, at least not for the entire winter. Typically it's around the 40s during the day and maybe low 30s overnight. Which is why heatpumps work here, the milder weather. It's most likely leaking windows or poor insulation.