Phelan heat pump installs follow the same cold-climate equipment rules as Oak Hills. At 3,800 ft elevation, winter overnight lows hit the high teens regularly, and standard heat pumps lose significant capacity below 30°F. We spec cold-climate variable-speed inverter units (Mitsubishi Hyper-Heat, Daikin Aurora, Carrier Infinity) for Phelan installs. These maintain rated heating capacity down to 5°F. Dual-fuel systems are also popular in Phelan because most properties already have propane infrastructure (tank, line, regulator). The heat pump handles cooling and most heating, the backup propane furnace fires only on the coldest nights below changeover temperature. Smart thermostats handle changeover automatically. For Phelan homeowners considering heat pump conversion from existing propane-only heating, the rebate math is interesting: SCE electric rebates apply ($300-$1,500), but SoCalGas natural gas rebates do not (since you are not on natural gas to begin with). Liberty Utilities propane rebates may apply where your propane provider participates.