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Auxiliary Heat-Emergency Heat

(What Does It Mean? What's The Difference?)

Q: My heat pump thermostat reads "AUX HEAT"; the other "EM HEAT". What's the difference?

A: Aux (auxiliary) Heat. The balance point (when it can no longer efficiently transfer heat from the outside air) of an air source heat pump, is usually about 35 degrees. The thermostat senses this and automatically turns on the electric heat strips to provide the additional heat needed. It signals this by turning on the "AUX" heat light.

Em (emergency) Heat. You can also manually turn the electric heat strips on if needed (defective equipment; cold house). Manually turning on the electric heat strips is signaled by the "EM" heat light and will turn the "outdoor" heat pump off.

We hope this brief explanation has been of some assistance. Obviously, not all possible conditions are covered.

Remember:

The company You Choose To Install and Service Your System Will Determine The Degree of Comfort and Satisfaction You Enjoy.

These "Common HVAC Problems" are provided FREE and as a consequence Climatemakers does not assume any liability resulting from any information we provide. In all cases where there is any possibility of injury, consequential damage, direct damage to your equipment or when recommended by the equipment manufacturer, your system should be repaired, inspected or maintained by a qualified technician.

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If you find an error on this page I would appreciate it if you would email us or call (757) 600-0422.

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