I had a 1.5 ton Mitsubishi mini-split heat pump installed in May. It is the high efficiency unit and very quite. Works on a 20 amp circuit. So far works great heating and cooling the place. Don't need propane heating with all the tanks, venting and furnace. The specs say it will provide heat down to -30C, I have a wood stove as backup. Warranty is 10 years parts and labour. The only maintenance is cleaning the filter screen in the wall unit and checking the outside unit for any leaves on the back grill.