An air-source heat pump specifically engineered with enhanced vapor injection, variable-speed compressor technology, and refrigerant circuit modifications to maintain meaningful heating capacity and efficiency at outdoor temperatures as low as negative 13 to negative 22 degrees Fahrenheit. These units are designed to replace fossil fuel heating in very cold climates with little or no backup heat.
HVAC Glossary
Cold Climate Heat Pump
Last updated: June 9, 2026