The most popular type of heat pump uses the outdoor air as its heat source/sink. The air source heat pump market is the largest segment, accounting for the majority of unit sales. Air source heat pumps (ASHPs) are relatively low-cost, easy to install, and available in ducted (central) and ductless (mini-split) configurations. As homeowners replace old furnaces and air conditioners, the air source heat pump market is growing, with new models designed for cold climates.

The broader heat pump market is dominated by ASHPs. The air source heat pump market for "ductless mini-splits" is popular for room additions, garages, and homes without ductwork. The air source heat pump market for "multi-zone" systems (one outdoor unit connected to multiple indoor heads) is common. The air source heat pump market for "ducted" systems (replacing a central AC and furnace) is used for whole-home heating.

The air source heat pump market for "cold climate" models (CC-ASHPs) are designed to maintain capacity at low temperatures. They use "enhanced vapor injection" (EVI) or "flash injection" compressors, larger coils, and variable speed fans. The air source heat pump market for "low-temperature" performance is measured by the "coefficient of performance at -15°C". The air source heat pump market for "backup" electric resistance heat is still needed for the coldest days in some climates.

The air source heat pump market for "efficiency" is rated by SEER (cooling) and HSPF (heating). The air source heat pump market for "ENERGY STAR" models meet minimum efficiency thresholds. The air source heat pump market for "inverter" (variable speed) models are more efficient than single-stage. The air source heat pump market for "two-stage" compressors are a mid-range option.

The air source heat pump market for "installation" requires a trained contractor. The air source heat pump market for "sizing" (using Manual J) is critical; oversized units short-cycle (reduce efficiency and life). The air source heat pump market for "refrigerant" charge must be verified. The air source heat pump market for "airflow" (ducts) must be adequate.

Looking ahead, the air source heat pump market will see the adoption of "propane" (R-290) as a refrigerant. The air source heat pump market for "integrated" controls (with smart thermostats) will improve usability. The air source heat pump market for "grid-interactive" capabilities will allow utilities to shift load. As gas prices rise, the air source heat pump market will become even more economic.

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