THere's something wrong with your heat pump, or you needed/need a different unit. I live in New Mexico @ 6000', I have Mitsubishi Hyper units, and it has to ge

THere's something wrong with your heat pump, or you needed/need a different unit. I live in New Mexico @ 6000', I have Mitsubishi Hyper units, and it has to get down to below 10 degrees before you can even see any difference in the heat pumps' operation. Even so, they still get the house up to temperature, just takes a bit longer. The difference in cost over regular Mitsubishi's was low single digit thousands.