Homes with heat pumps are equipped with a two-part system: The heat pump, which is the outdoor element, and the auxiliary heating source, which is the indoor element. Contact us at Jackson & Sons at 919-734-9611. At temperatures around 45 degrees, the outside coil can and will freeze up, which will cause the system to go into defrost mode. By losing the automatic switching to aux heat as needed you spend more money to heat your home when you switch to aux heat by itself using the Emergency heat function. This system is activated manually by a button/switch on your Thermostat. While in defrost mode, the outdoor unit will signal the air handler to turn on the auxiliary heater. If this happens, the heat pump and heat strips will run together to create warmer air to more efficiently heat the home. In MY OPINION, the NEST is not the correct thermostat for your system. Emergency Heat Heat pump systems have two units - one outside the home and one inside the home. E: Emergency heat (In emergency mode "Y" is not energized and E is energized to indicate the need for emergency heat. When the heat pump can no longer maintain the desired temperature setting, then the auxiliary heat must come on to assist. You won’t find an option to use Emergency Heat, but your thermostat will automatically use alternate heat when needed. Using a heat pump for cooling and heat down to about 40ºF works well but when the weather gets colder a back up auxiliary system -- preferably gas or oil -- … Do All the Ductless Heat Pumps Offer Auxiliary Heat Auxiliary, the heat strips activate to supplement the heat pump's output when it can't keep up with the load. Besides a low temperature, your heat pump also goes onto emergency heat if there is ice frozen on its surface. First “Auxiliary Heat”, “Strip Heat”, “Emergency Heat”, “ Radiant Heat ” are all used to reference the same heating mechanism; your electric heat strips that come with a heat pump. 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. All Content Copyright © 2021 Scott's One Hour Air Conditioning & Heating | Privacy Policy | Sitemap, Scott’s One Hour Air Conditioning & Heating, HVAC Systems in Tampa Bay & Surrounding Areas, Heating System Installation & Replacement, Air Duct Cleaning Services in Tampa Bay & Surrounding Areas, Increased Energy Efficiencies in New Heat Pumps, Scott’s One Hour Air Conditioning & Heating Blog. R: +24vac. When we come out to do our 77-point checklist on your system, we’ll actually kick it into defrost mode to make sure it’s working. This means, when the temperatures start to drop and your heat pump cannot produce enough hot air to warm your home the aux heat will turn on. When you need heating or air conditioning repairs, maintenance or system replacements, you need a company you can count on for dependability and quality service. As the name indicates, auxiliary heat, or emergency heat depending on your system, is just a secondary heat source. I control that temperature through my WIFI Thermostat. Mine is not Honeywell, so check your instructions. When the heat pump outside is not working, and you run the risk of damaging it more by continuing to use the unit, switching the Emergency Heat (Em. For more information on our heating services, call Scott’s One Hour Air Conditioning & Heating at 813-882-4776 or contact us online. The unit outside your home is a heat pump and the unit inside the home is the auxiliary heating system. Both forms of heat are the exact same heat … The heater is typically not designed to heat your home to 80 degrees, but only as a supplement heat source while the heat pump is in defrost mode or as an emergency backup in the event of a system failure. ** Auxiliary Heat. Once the outdoor system is defrosted, the auxiliary heater turns off and the system continues in heat pump mode. Auxiliary heat/ Emergency heat helps the heat pump keep up when cold outside or the temperature differential on the thermostat is large. Auxiliary heat is when the secondary heat source turns on automatically. Emergency Heat – This is when you turn on the secondary heat source. This mode is used if the heat pump fails during cold winter temperatures and the compressor must remain off.) In Florida, you have three types of heating sources with your HVAC system: For this discussion, we will focus on the difference between a traditional heater/furnace and a heat pump system. The Emergency Heat or Auxiliary Heat setting is the second stage of your heating system that is used when the temperature is too low for the heat pump to be able to remove heat from outside, typically below 35 degrees Fahrenheit. A heat pump can satisfy your home’s heating needs as long as the outdoor temperature remains at or above 45 degrees. As outdoor temperatures rise and secondary heat is no longer required, the unit automatically turns off the auxiliary electric coils. Terms & Conditions | Privacy Policy | Sitemap | Design & Marketing by LeadsNearby, Why Your HVAC Purchase Can Be Affected by Your Neighborhood. To summarize, while these terms can be used interchangeably and refer to the same type of heat, auxiliary heat is when your heat pump’s heat strips turn on automatically. Emergency heat activates the secondary heat source to provide 100% of required heat. Auxiliary Heat vs. For most heat pumps, the supplemental heat source is electric resistance (strip) heat. Auxiliary Heat Your auxiliary heat, as just described, supplements your heat pump’s heat when it needs it. 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. Down to a certain temperature, there’s sufficient latent heat in cold air to maintain indoor temperature settings. No-frills heat pump systems without the auxiliary heat capability sometimes make that feature an add-later option. When outdoor temperatures drop below the tipping point, heat pumps offer two options: auxiliary heat and emergency heat. something called "emergency heat" or "auxiliary heat". To manage such situations, some heat pumps comes with auxiliary/emergency heating option. Emergency heat is the use of the Auxiliary heat as the primary heat source. This heater is the exact same heater as the auxiliary element, only used in a different format. Switching to the emergency heat setting forces your heat pump to bypass the method it typically uses to produce warm air and instead rely solely on heat produced by the heat strip coils. Different systems and thermostats have different ways of determining when the second-stage heat comes on to assist the heat pump, but it is always done automatically. Emergency Heat is when you use your supplemental heat (2nd stage) by itself, without the use of your heat pump (1st stage heat). The heat strips run the same either way. The important thing to remember is that “AUX” heat is fast and dependable but it’s also more expensive than heat … Many Floridians who lived up North do not understand the difference between auxiliary heat and emergency heat. Note: If Alt heat (not AUX heat) appears, your Nest Thermostat E is configured to work with a dual fuel system. Both of these wires are needed for Emergency Heat. Here in Florida, we typically use the heat pump for our primary source of heat when heating the home; however, this unit also has a limit. By losing the emergency heat function you can NOT switch to just aux heat if the HP ever has a problem. The first function is to back up the heat pump if the thermostat has a difference of 3 degrees or more from the set temperature to the actual temperature inside the home. Because consumers have many more auxiliary heat options to work with for augmenting heat pumps, this allows them to experience a winter or two in a milder climate zone without the feature before committing to the extra investment, whichever one it may be. 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. If outdoor temperatures temporarily drop and your heat pump can no longer extract enough heat, the proper mode is automatic auxiliary heat. In emergency mode, conversely, the heat pump function is totally disabled and the system relies entirely on secondary heating coils. When winter temperatures plunge, at some point your heat pump may require either auxiliary heat or emergency heat to keep the house warm. 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. How to Maintain Good Airflow in Your Home, From Heating to Cooling: To-Do Before Turning on Your Air Conditioner. So it relies on an auxiliary (AUX) heat coil (like the ones you see in a toaster) or a furnace to heat your home. This heater is an electric heater similar to a toaster oven and will supply supplemental heat to the home while the outdoor unit is defrosting itself. For more about understanding the auxiliary and emergency heat mode for your heat pump, contact the professionals at Jackson & Sons. An example when emergency heat may be used could be when a part has been ordered for a needed repair and your HVAC professional has shared that by switching to emergency heat, your home will continue to be warm for your family. The system continues to operate in emergency mode until the user manually turns it off. When the UI calls for heat and the furnace is brought on it reads Aux Heat because that is the heat source it is running. Emergency Heat is typically triggered when it is 35°F and below outside. This setting should be used only if there is something wrong with your heat pump, and even then, only as a short-term fix until you can have the system repaired. The same goes for warmer climates. The short answer is that auxiliary heat and emergency heat refer to the same thing, and are somewhat interchangeable. Moving heat- In heat mode, your heat pump is like an air conditioner working in reverse to pull heat from the outside to inside your home (the opposite of how it works in cooling mode). Does Auxiliary Heat Cost More to Run? That's where supplemental heat—which is NOT the same things as emergency heat—kicks in. Emergency heat only makes sense when there is some sort of secondary heat source and really even then, it only helps if the secondary heat source is sufficient to heat the space as in the case when the secondary is a furnace, Hydronics or a large heat kit. It becomes necessary once the temperature drops below a certain point. The outdoor temperature where this occurs varies according to the efficiency of each particular heat pump, but it’s typically below 40 degrees. Basically, auxiliary heat and emergency heat are the same thing. EM heat is an option on your thermostat that you can manually turn on to activate backup heating. Note: In some cases, your heat pump’s AUX heat could be a gas furnace, but since Phoenix typically has mild winters, some AZ homeowners will have electric resistance as their AUX heat. Auxiliary Heat – This is the secondary heat source that turns on automatically. We basically freeze the system up and make the equipment work a little harder to make sure you’ll have heat when you need it. The difference between auxiliary heat and emergency heat is simply the name. If you haven’t had that check done in a while, give Scott’s One Hour Air Conditioning & Heating a call at 813-882-4776. Because electric heating coils consume lots of electricity, heating costs in the emergency mode will increase dramatically if consistently used for long periods of time. Instead, they extract latent heat energy in outdoor air, concentrate it, then circulate it through the home’s ductwork. Electric heat strip - This electric heat strip is auxiliary heating (or “aux heat” as it shows up on your thermostat). 4) Auxiliary heat is malfunctioning Below 40 degrees, your heat pump struggles to heat your home. It’s important for homeowners to fully understand what the term auxiliary … When aux/emergency heating mode is turned ON, rooms are heated really quickly. What Are the Best Ways to Eco Upgrade Your Home? Emergency heat is when the heat strips turn on due to you manually selecting the emergency heat setting. C: Common. What happens when your heat pump can't keep up? In this mode, the heat pump continues extracting as much heat energy as possible, but also adds heat from a secondary source to make up the difference. What Is Emergency Heat? As temperatures drop further, however, the heat pump may not extract enough heat. Our goal is to help educate our customers in Eastern North Carolina (including Wayne, Johnston, Greene, Lenoir, Pitt and Duplin Counties) about energy and home comfort issues (specific to HVAC systems). While auxiliary heating indicates that your heat pump automatically switched from normal to auxiliary heating, emergency heating is a setting that allows you to manually set your system to auxiliary heating. This secondary heat source is typically electric heating coils integrated into the system. Auixiliary Heat will turn on automatically when heat can no longer efficiently transfer heat from the outside air to heat pump. Emergency heat is the same thing as auxiliary heat. Your display is working correctly and exactly as it is suppose to. Heat) on will turn off the heat pump and run the auxiliary heat only. Note that auxiliary heating is not the same thing emergency heating (displayed as “EM HEAT” or “EMER” on most thermostats). This extra heat kicks on at a preset temperature. Emergency heat is a mode the user manually selects if the unit is not providing any heat for some reason such as a malfunction. Auxillary Heat implies that you have an Air Source Heat Pump. Once the thermostat set point is within 2 degrees of the temperature inside the home, the auxiliary heat will turn off. As outdoor temperatures rise and secondary heat is no longer required, the unit automatically turns off the auxiliary electric coils.

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