https://www.lennox.com/buyers-guide/guide-to-hvac/glossary/two-stage-operation

Two-stage operation, or two-stage cooling, means the air conditioner or heat pump has a compressor with two levels of operation: high for hot summer days and ...

https://www.goodmanmfg.com/resources/hvac-learning-center/before-you-buy/what-is-a-two-stage-air-conditioner-or-heat-pump

A two stage-cooling feature allows for two output levels of air condition or heat pump operation depending on your cooling needs.

https://www.bryant.com/bryant/en/us/products/heat-pumps/226a/

Enjoy the energy-saving, quiet operating, consistent comfort of two-speed operation with this Preferred™ Series heat pump. With cooling efficiency up to 17.5 ...

https://www.buildings.com/news/industry-news/articleid/15742/title/maximum-comfort-and-energy-savings-with-two-stage-heat-pumps

May 9, 2013 ... On the other hand, the two-stage compressor can operate at part load or full load capacity. When cooling is needed, the two-stage heat pump ...

https://www.youtube.com/watch?v=6URIYtahXzg

Feb 2, 2012 ... http://www.lennox.com/products/heat-pumps/ ) Unlike typical single-stage heat pumps that operate only at full power, Lennox® heat pumps like ...

https://www.cooltoday.com/blog/heat-pump-buyers-guide-4-factors-to-consider

Oct 20, 2014 ... Two-stage heat pumps cost more upfront, but will cost less to operate. But people mainly get them because of the extra comfort they provide.

https://www.cooltoday.com/blog/what-is-a-two-stage-air-conditioner-or-heat-pump

Jun 14, 2012 ... If you're looking for a system that maximizes energy efficiency, a two-stage AC or heat pump may be what you need.

https://www.pickhvac.com/faq/singal-stage-vs-two-stage-for-heat-pumpac/

Single stage compressors in ACs and heat pumps have only one speed – 100%. .... Operating cost: The more efficient your AC is, the less it will cost to run.

https://nest.com/support/article/What-is-a-multistage-system

The Nest Thermostat E supports one stage of heating, one stage of cooling, and a ... and two stages of heating and cooling with auxiliary heat for heat pumps.

https://www.pvhvac.com/blog/heres-the-lowdown-on-single-stage-two-stage-and-variable-speed-air-conditioning

A two stage or dual stage compressor sits somewhere between single stage and variable speed systems in terms of how it functions. While it doesn't operate at ...