01/25/2026
We’ve had a lot of calls this weekend about some very BAD advice circling around online. If you have an ALL ELECTRIC home, DO NOT switch over to Emergency heat unless your heat pump is actually broken.
Using Emergency heat when it's not necessary allows more ice to build up on the unit, uses more energy, but it also puts even more unnecessary strain on the electric grid that can lead to rolling blackouts.
Leave it in Heat mode, it is still moving heat into the home more efficiently than electric heat strips alone. The thermostat will cycle auxiliary electric heat as needed to assist. The temperature will drop a degree or 2 and that is normal.
Even heat pumps 20 years ago are rated to operate down to 0⁰F with a COP higher than electric heat strips alone. They will lose some capacity but it's better to use aux heat as needed than to use 100% auxiliary heat. New cold climate heat pumps can produce 100% capacity at low temperatures and some can operate down to -40⁰
The heat pump is designed to defrost itself and even run non-stop. Turning it off can actually allow more ice to build up on the fins and the blades because it's sitting.
If ice builds up on the fins (ice not frost) then you may have a problem with the defrost thermostat or defrost controls or defrost settings. In that case, use emergency heat and schedule a service call during the week. (Nonemergency)
It is normal for your heat pump to make some funny noises and even "smoke" which is actually stram from the defrost cycle. The outdoor fan will also cycle off. Let it run it's cycle and it will go back to heating shortly. This does not require a call for service.
The heat pump may produce lower temperature heat but that is also normal. As long as it's warmer than the air temperature, thermodynamics means it is still heating.
If you have dual fuel, (heat pump with natural gas, propane or oil heat) it should automatically switch over to the auxiliary heat for you.
As always, stay safe and warm!