Any heat pump system uses refrigerant to supply warm air in winter and cool air in summer and it is exactly like your air conditioner except that when it is in the heating mode it reverse the flow of refrigerant.
Millions are in use across the United States and are successfully heating homes even in the coldest of climates.
Heat pumps are growing in popularity today because of the higher natural gas and fuel oil costs as well as the increased chances of fuel shortages caused by turmoil in the middle east.
Homeowners are now getting much wiser and are seeking ways to reduce their heating and cooling costs and protect their pocketbook from world affairs.
All the heat pump systems available today are extremely efficient and are a reliable source of heating and cooling.
This is a simplified explanation of exactly how a Heat Pump Works...
An “air-to-air” heat pump system, like your air conditioner, has two parts. An indoor air handler or furnace with a coil and a blower that circulated the warm or cool air through your house and an outdoor unit just like an air conditioner.
During the summer cooling season the heat pump system refrigerant transfers heat from the air inside your home to outside just like your air conditioner. see diagram below
While in the winter the process is completely reversed and the refrigerant transfers heat from the outside to the inside of your home. see diagram below