At 5,280 feet a gas furnace has to be derated or it burns dirty. Brick bungalows and wartime houses in Highlands and Park Hill still push that heat through leaky ducts. A heat pump sized for altitude covers both seasons.
Ask for a heat pump sized to keep your home warm on the coldest usual winter day. The price uses the CO and utility programs your address qualifies for. No sales call, no information sold, no pressure.