Air Source Heat Pumps Reversing Valve Air Source Heat Pumps are residential and commercial HVAC units that extract heat from the outside air and bring this heat inside the home. On this YouTube video learn about the operation of the reversing valve and the defrost board. In this video, you'll find Air source heat pumps get a bad rap. They are limited in their use of the outside air as a heat source. The colder the outdoor air gets, the less efficient heat pumps get. They are the most common type of heat pumps and the least expensive to install. These are similar to air conditioners operating in reverse. By default, the majority of air source heat pumps work in heating mode. But a reversing valve changes the flow of refrigerant in order to make the air inside the home cold like a regular air conditioner. The reversing valve or switchover valve as some call it stays in heat mode because heating is more important than air conditioning for most of the country. A defrost board plays a big role in the operation of a heat pump as well. Please visit our website @ http://www.foxfamilyhvac.com/ If you'd like to book an appointment with Fox Family Heating and Air in Sacramento, El Dorado, or Placer County, CA https://book.housecallpro.com/book/Fox-Family-Heating-and-Air-Conditioning/babd3396dba440e1afac01c631d95f1d Visit me at our great Facebook page for Fox Family at https://www.facebook.com/FoxFamilyHeatingAirConditioning 00:00 Intro 00:40 Cooling Mode 1:29 Reversing Valve 2:05 Defrost Cycle 3:05 What happens in defrost mode? 4:20 Closing