Western Heating & Cooling optimizes the performance and energy efficiency of heating and cooling systems that operate in the dry climate of the Western USA.
Air-source heat pump technology has come a long way in the last 10 years:
"technological advancements have now yielded hundreds of models that can operate efficiently in temperatures as low as 5°F, with some units performing down to -12°F" —@RockyMtnInstrmi.org/insight/economics-of…