EVI stands for (Enhanced Vapor Injection), is an inverter heat pump that is somehow low ambient. The heat pump utilizes EVI technology which can operate under extremely low temperatures of about -25℃. It draws energy from ambient air, uses it to provide heat to your house. An EVI pool heat pump utilizes a smaller inner plate heat exchanger known as an Economizer. This unit is found in the refrigeration cycle, and it uses a bypass valve to bypass hot refrigerant vapor on the condenser to the HX. Heat energy is then exchanged, increasing the gas temperature much more, after which it is injected into the head scroll at mid-range pressure via a separate injection port.

 

All heat pumps have their limits, while some may push the boundaries of cool temperatures. Contrary to people's beliefs, heat pumps work great even in very cold seasons.

They can operate in low temperatures with double the efficiency of standard or gas heating, like electric furnaces or baseboard heaters. Heat pumps don't directly pump air: they use the heat from the surrounding air and utilize it to warm your home. 

However, a marginal difference in thermal energy makes a significant difference in its efficiency. To counter this drawback: heat pumps need to work harder to maintain a similar indoor temperature. It's because of this reason that heat pumps begin to lose their effectiveness at about 40 degrees F and reduce the efficiency much more at about 25 degrees F.

The typical answer is yes; a heat pump will work in the cold climates or any weather. As a matter of fact, heat pumps were designed to keep you warm during the cold seasons. They provide an energy-efficient means of heating to other heating sources like air conditioners or even furnaces, especially in the cold climates. During winter seasons, heat pumps operate by transferring hot ambient air from the surrounding environment, which is then passed into its unit and undergoes various processes. The final output provides comfortable temperatures into your own home to get you through those harsh winter climates.