Wrightwood is alpine, not desert. At 6,000 ft elevation, winter overnight lows regularly hit single digits during cold snaps and occasionally below zero. Standard heat pumps simply will not work here. We spec ONLY cold-climate variable-speed inverter units (Mitsubishi Hyper-Heat, Daikin Aurora, Carrier Infinity) for Wrightwood installs. These units maintain rated heating capacity down to 5°F and reduced (but still functional) capacity to -13°F. Dual-fuel systems with propane backup are even more popular than pure heat pump in Wrightwood because the propane backup eliminates any cold-snap performance worry. Propane is the standard fuel here (no piped natural gas at this elevation), and most Wrightwood homes already have propane infrastructure for furnaces or wall heaters. We can integrate dual-fuel changeover into your existing propane setup. Many Wrightwood homes also use heat pumps as their primary cooling source (mild summer climate means light AC use), with propane or wood as primary heat. Heat pumps in this configuration handle the rare summer 90°F afternoons without needing a separate central AC.