New heat pump owner. 3-ton system installed August 2023. Local climate is up to triple digits F. in summer, cool and wet in winter: 16F in 2011, 22F in 2018; over the years since then, lows of 25F a few times. (Official heating design temp for our county doesn’t work well because there’s no weather station anywhere near and terrain goes from lowlands to high mountain passes.) Bosch BVA-36WN1-M20 variable speed air handler with heat strips in attic (no other backup heat) and Bosch BOVA-36HDN1-M20G variable capacity inverter compressor outdoors, Ecobee Premium smart thermostat.