New Danfoss PSH Compressor for Heat Pumps in Colder Climates


Danfoss’ new PSH scroll compressor with vapor injection may be a game-changer for heat pump adoption. Its ability to operate in a wider range of ambient temperatures allows for an effective and efficient heat pump in colder climates. Increasing the operating range of heat pumps is essential for achieving decarbonization.


The PSH compressor’s unique vapor injection technology allows for a wider range of operating temperatures.


An R-454B optimized dedicated heat pump compressor with higher allowable discharge gas temperature limits, the PSH compressor with vapor injection is also multi-refrigerant qualified for R-410A and R-454B and simplifies the transition to R-454B, which has a lower global warming potential. It is designed for medium and high temperature applications (up to 65ºC) and low ambient operation. A large range of compressor capacities are available from 7.5-40 tons of refrigeration and individual compressors can be manifolded together to further increase system capacity.

To continue the increase of the market transition into heat pumps and extend the use into colder climates, the compressor combines the ability to use both liquid and vapor injection in the same product. Tandems and trios can also be used with a single economizer heat exchanger which simplifies the system design and offers greater flexibility. The same compressor can be used for both R-410A and R-454B and in both liquid and vapor injection operating modes. It can be manifolded and used with a single economizer heat exchanger.

It is available in all required voltages and frequencies, which allows it to be used both in the United States and globally. The PSH compressor with vapor and liquid injection can be used in heat pumps in mild climate zones to areas where very cold climates are normal and expected. By increasing this operating range, it will further drive the market adoption of heat pumps and decrease the need to burn fossil fuels for heating.

“The PSH compressor with vapor injection is a game-changer in the path toward electrification,” said Nick Mislak, Regional Segment Marketing Director for HVAC. “By enabling heat pumps to operate efficiently in colder climates, coupled with low-GWP compatibility, the PSH provides the technology needed to move toward clean heat sources while maintaining customer comfort.”


About Danfoss

Danfoss engineers solutions that increase machine productivity, reduce emissions, lower energy consumption, and enable electrification. Our solutions are used in such areas as refrigeration, air conditioning, heating, power conversion, motor control, industrial machinery, automotive, marine, and off- and on-highway equipment. We also provide solutions for renewable energy, such as solar and wind power, as well as district-energy infrastructure for cities. Our innovative engineering dates back to 1933. Danfoss is family-owned, employing more than 40,000 people, serving customers in more than 100 countries through a global footprint of 95 factories. For more information, visit