The weather chilled enough that our new Fujitsu 36LMAS heat pump is fully operational transferring outdoor heat into the house (during the cooling season it does the opposite). Our equipment continues to be amazingly quiet, quite unlike the natural gas furnace the heat pump replaced. It’ll be interesting to compare costs with last winter, though heating a house with a fully variable heat pump doesn’t work the same as a single cycle furnace. The heat pump continuously runs but adjusts the pump and fan from heating at full to a trickle of heat to maintain temperatures. So temperatures stay constant, as opposed to a single cycle furnace’s swinging indoor temperatures from chilly to screaming hot (in our case). With the heat pump being so quiet and keeping the house temperature way more even, I’m far more inclined to heat the house more. Which doesn’t bode well for heating costs! But at least there’s no longer a NOx, CO, and CO2 generating machine in the house, right?