Mount Laguna gets serious winter, what heat pump works at 6,000 feet?
Cold-climate-rated variable-speed heat pumps (Mitsubishi Hyper-Heat H2i, Bosch IDS Premium, Trane XL21i) maintain 80 to 100 percent of rated heating capacity down to minus 13 degrees, which covers any conditions Mount Laguna sees including occasional below-zero overnight lows. Standard heat pumps lose capacity below 35 degrees and are inadequate for this climate. Cold-climate equipment is non-negotiable here.