When I arose, at 7:05 this morning, it was -4.1º Fahrenheit outside. No wind is showing, but there’s a possibility that the anemometer is frozen in place; I’ll tap it loose when I go outside.
I have previously noted that we have backup heat here on the farm, with a propane fireplace, something we installed during our 2018 remodeling project, because our primary heat is an electric heat pump. The thermostat for the fireplace was set at 64º F, so that it would come on if the primary heat failed overnight, but shouldn’t come on as long as the heat pump was engaged. Guess what: even though the primary heat was on and working, the fireplace still came on, which tells me that the heat pump was unable to keep up! Heat pumps work by extracting heat from the atmosphere around the outside condenser, but when there’s not a lot of heat to extract, they lose efficiency. Continue reading

