Hephaestus technology is a specialized engineering approach used in some of our heavy-duty heat pumps to ensure they can produce heat in extreme cold. Systems with this technology often feature larger outdoor coils and heated compressors to extract every possible bit of thermal energy from the air. This is a primary feature of our high-performance heat pump systems. If you live in a climate where temperatures regularly drop below zero, you should look for this or similar "Hyper Heat" specs. This technology is frequently paired with our 30000 BTU or larger units to provide whole-home warmth. You can explore these cold-weather champions in our Cooper&Hunter collection.