Supplemental Heat - Residential
Proper equipment sizing may require considering supplementary electric heaters for those times when the heating load exceeds the capacity of the heat pump. The designer should determine the proper use of supplemental or backup heat for each installation.
Here are some things to consider:
There are various approaches, which include:
The second alternative is common in areas where the heat pump is sized for the cooling load; it allows a smaller system with a lower installed and operating cost.
Where supplemental heat is used, there are several typical approaches:
Duct heaters should be UL listed for zero clearance and meet all requirements of the National Electric Code, and be serviceable without removing the heater.
Duct heat packages should include a hinged control panel covering fusing, magnetic contactors, and a blower relay. Typical packages range from 5 to 15 kW at 230 volts.