I got a notice that my axillary heat has been running for over a hundred and 80 minutes in the last 24 hours and at that was too long. Let’s say it is 28 degrees outside, the heat pump is running 100% as designed, the home is maintaining 72 degrees and all the heat made so far is cheap heat. Question. Note: A heat pump combined with a gas furnace is also called a “duel fuel” or “hybrid heat” system. Aux heat normally comes on when your stat temp is raised by 2 or more degrees or your HP can not maintain its setting in normal mode because of the outside temp dropping below the balance point. I have noticed that the Auxiliary heat is probably on about 15 minutes per hour. Now let’s say it cools to 26 degrees outside. Here’s how it works. Auxiliary heat can handle more extreme temperatures since it uses electric heat strips. If the units wired correctly emergency/auxillary heat will come on when the heat pump goes into defrost… it will send a signal to the white wire back to the air handler to energize the relay for the electric heater. hooked up, my inside temp dropped 5* in an hour with the pump running constantly. You shouldn’t ever use EM heat unless there’s truly an emergency—like your heat pump isn’t working— because backup … Although having the auxiliary heat function is useful, you’re going to prevent the use of it as much as possible. What this means, unfortunately, is that it’s more expensive than the conventional heat provided by a heat pump. Like just stated, when your auxiliary heat function is running, it’s going to use up much more energy than your heat pump. EM heat is NOT the same thing as AUX heat: AUX heat signifies that your heat pump has automatically switched over to backup heating because temperatures are too low. Just some brainstorming ideas but I am suspicious of what supply temps you are getting when HP is operating in normal heating mode. Running this form of AUX heat for too long can get pricy, so many Minnesota homeowners opt for the second form of AUX heating: a gas furnace. Knowing the difference between your heat pump’s auxiliary heat and emergency heat will help address the question from above. Emergency Heat, also known as “auxiliary heat”, is the second stage of heat that your thermostat runs on when the temperature is too cold for your heat pump to extract heat from the outside. Contact a Minnesota tech when AUX heat malfunctions. We're right back at my heat pump running constantly, and using the aux. Difference Between Auxiliary Heat and Emergency Heat. If I had known, I would have asked for gas on the second and third floor for sure!! Which is 1.5 to 2 degrees lower than thermostat set point - the electric heat or auxiliary heat would then come on to make up the temperature difference. We have a heat pump and there's no gas heat or anything like that. Auxiliary Heat. Letting the heat strips run all winter might keep you cozy, but it definitely has the potential to put a chill on your finances. Auxiliary Heat running too much I have an Amana heat pump and air handler with a Honeywell Prestige thermostat which was all newly installed this past July. Once it gets close to the actual setpoint, the aux heat de-energizes and the heat pump mode of the system remains operating to generate heat and will shut off if the temperature is satisfied. just to hold 68*. The house temp is set at 68 and the outdoor temp has been in mid forty to mid 50 range. It popped up on my ecobee3 Lite. The auxiliary heat (electric resistance heat, or back-up heat) is minimized since it is more expensive. 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