As we mentioned above, AUX heat usually costs up to 50% more than heat transfer, which means if your system is running on AUX heat when it shouldn’t be, your heating bill is likely going to be a lot higher than you’d like it to be. Once the ice on the heat pump has mostly melted, the heat pump goes back to normal and AUX heat turns off. heat pump balance doesn't seem to do anything other than raise the outside temp level that the aux heat is able to kick in. You’ll find a picture of which wires are connected to your Nest thermostat and which function they control. You’ll also need to tell your Nest thermostat which wire will be used for Emergency Heat. I've decided to get a Nest thermostat, and chatted with the folks at Nest … Important: Emergency Heat is usually expensive and inefficient. Emergency Heat is typically triggered when it is 35°F and below outside. The home temperature raises to a point just short of the thermostat set point and then the auxiliary heat turns off as soon as possible. Double check your wiring diagram and that the wires are in the correct connectors on your Nest thermostat. Go to the first section of this article for steps on how to check. If there's a wire in the W1 connector, make sure it says AUX heat. When ice accumulates on the outside of your water heater, you will need to unfreeze it. When switching your unit to emergency heat, you’re forcing the backup heat system to do all the work. So while the heat does turn on at a 2 degree difference, it will blow cool air from that point until the 4 degree swing is met. 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. It's still dead, but the guy is finally coming tomorrow with a neat HVAC unit (the warranty folks dragged their feet for two months, fun!). The Nest Thermostat is pretty easy to use, but it isn’t so apparent how to turn off the thermostat when you don’t need heating or air conditioning on.. RELATED: How to Install and Set Up the Nest Thermostat Sure, you could just set the Nest to “Away” to stop it from heating and cooling, but that won’t work very well if you have Home/Away Assist enabled. Last year I also had a Rite Temp t-stat that did not use the aux heat nearly as much as the current honewell. Add a few layers to your outfit or sleep with an extra blanket to keep your furnace from working so hard. Looks like you're using new Reddit on an old browser. I saw some setting about when the outside temp reached X degrees, start using Aux heat. Check to make sure that your O/B wire is fully inserted. I have an Amana heat pump system for cooling and heating and I'd like to disable the aux heat. For example, if your AUX lockout temp is 40ºF or 4.4ºC, then AUX heat will come on when the outdoor temperature drops below 40ºF or 4.4ºC. The instructions depend on the thermostat model you have. https://nest.com/support/article/What-s-Emergency-Heat-and-does-Nest-support-it, New comments cannot be posted and votes cannot be cast. If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat. Discussion on Google Nest products, including installation and configuration. One option is to try turning down the target. It will then turn back on when the temp drops a few degrees below the set point. Check in Settings Equipment. Emergency heat is only compatible with Heat Pump systems. Then click Done/Done/Scroll to the end and exit settings. You can change it from the Nest app or from your thermostat. After setting a temp click Done/Confirm. Always follow this diagram to connect the Emergency Heat wire to the right thermostat connector. We appreciate your patience and understanding during this time. This is the AUX lockout temp that is controlled by Heat Pump Balance. Press the thermostat ring to bring up the. It should really be smart enough to realize that it isn't able to heat and immediately kick in aux heat when it knows it's so cold outside! Now you see this option: "Use the heat pump auxiliary heat when the outside temperature of below". In aux mode, your heat pump will continue to use outside air to warm your home to assist the secondary heat source. You should verify that the X wire on the old thermostat is not a common wire. On the Nest Thermostat: Push the Thermostat > Turn the outside dial clockwise to Mode > Push the Thermostat again to select to turn the heat on or off, depending on which setting it is on. Your Nest thermostat will use Emergency Heat to reach your set temperature as needed until you manually turn it off. My heat pump will now always run AUX heat whenever the outside temp is below 30, use assisted AUX heat from 30-40, and use only the compressor above 40. Then from the thermostat itself, go to Settings/Equipment/Continue/Continue/Heat Pump/Press whatever is currently selected Now you come to the setting: "Use the heat pump compressor when the outside temperature is above" This is the compressor lockout option that you cannot set from within the app. When the Nest first came out (and was quickly swooped up by Google), not a lot of people were sure what to do with it. If the home temperature goes down one, or sometimes two degrees, this causes the thermostat to bring on the auxiliary heat for a very short boost to supplement the heat pump. In case your heat pump isn't working correctly, you can select to always use alt heat.This video introduces 2 method to force alt heat to turn on.1. If the fan does not turn on, stop the test immediately. Your system doesn’t have Emergency Heat. This includes auxiliary heating system components. Therefore, if it’s below 40 outside and the auxiliary heat isn’t working, then your heat pump will just blow lukewarm or cool air. 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. I did all the correct wiring hookups and tests to confirm initial operation. If you have a heat pump, it is best to increase your heat setting by only two degrees at a time to prevent your auxiliary heat from operating. If it’s 30 degrees outside, it is unreasonable to expect the system to maintain an indoor temperature of 78 without using the heat strips. I frequently set the Honeywell TH8000 from 58 to 61 degrees at random times and to keep the aux heat from kicking in I have to setup the thermostat up 1 degree at a time. Recently replaced my Honeywell stats (split system) with Nest stats (upstairs/downstairs) System: Heat Pump 2 Ton/all electric/with aux heat - location North Carolina Having at least a perceived problem with upstairs system and the Nest operation. But the house just doesn't warm up until it gets above freezing, indicating that the emergency heat is never coming on. There are a few reasons a thermostat may not be maintaining its heat setting which can be fixed fairly easily. If you there are no wires in the O/B connector or W1 connector, make sure they haven’t come unplugged. I can manually force it to kick in by turning the heat up a few degrees, then back down to the desired temp once it kicks in. Tell us more and we’ll help you get there, Your current thermostat has a switch or a button labeled “Emergency.”. So it relies on an auxiliary (AUX) heat coil (like the ones you see in a toaster) or a furnace to heat your home. AUX heat turns on to keep you warm. But if your thermostat is not holding temperature then your home will feel cooler than it should. Difference Between Auxiliary Heat and Emergency Heat. The auxiliary heat setting is more energy and cost-efficient than emergency heat. Nest tries to heat a couple degrees past the set point and then shuts off. Electric heating coils will overheat, burn out turn on the fan and after a minute or two you should feel distinctly warm air coming out of the vents. Therefore, a heating system stuck in AUX heat will run up an energy bill. It shuts off the compressor and uses only AUX heat when the outside temp is below this number. Press question mark to learn the rest of the keyboard shortcuts, https://nest.com/support/article/What-is-Heat-Pump-Balance, https://nest.com/support/article/What-s-Emergency-Heat-and-does-Nest-support-it. 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