These supplemental heating sources are things such as the electric resistance heating at the indoor unit, gas, oil or even hot-water back-up systems. The auxiliary heat will kick on if the heat pump needs additional heating capacity to meet your set temperature. The difference between auxiliary heat and emergency heat is simply the name. 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. 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. The outlet temperature with and without Aux heat depends on outdoor temp, wattage of electric heat strips and CFM setting. The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. The thermostat will sense this and turn on electric heat strips automatically turning on the “AUX” heat light. Emergency heat is a mode the user manually selects if the unit is not providing any heat for some reason such as a malfunction. The difference in name "emergency heat" vs. "auxiliary heat" results from differences in needs based on your local environment. This is why it is only used in an emergency situation. When outdoor temperatures drop below the tipping point, heat pumps offer two options: auxiliary heat and emergency heat. Auxiliary Heat. The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. If you have any questions, please don’t hesitate to call us! Auixiliary Heat will turn on automatically when heat can no longer efficiently transfer heat from the outside air to heat pump. Auxiliary Heat Your auxiliary heat, as just described, supplements your heat pump’s heat when it needs it. The system continues to operate in emergency mode until the user manually turns it off. When the thermostat is in this position the compressor does not run, only the Emergency heat runs. This secondary heat source is typically electric heating coils integrated into the system. This will provide additional heat as needed. Supplemental heating sources are known as “second-stage” or “back-up” heating. All these are great questions! When a system is put on an emergency heat mode, the heat pump is shut off and completely bypassed. Please call to get service when this happens. This is when the outside is around 35-40 degrees and the indoor temperature is around three degrees cooler than the thermostat setting. As the name indicates, auxiliary heat, or emergency heat depending on your system, is just a secondary heat source. That is because the auxiliary heat does not get triggered until the thermostat and room temperature are about 3 degrees different. A heat pump can satisfy your home’s heating needs as long as the outdoor temperature … As temperatures drop further, however, the heat pump may not extract enough heat. If you can’t find your phone you can always make the same changes by using your thermostat. © 2019 AAA-1 HVAC | Site by Possible Zone Marketing. 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. It is signaled as “backup” for your actual heating system since the outdoor heat pump doesn’t seem capable of handling the situation on its own. Auxiliary heat/ Emergency heat helps the heat pump keep up when cold outside or the temperature differential on the thermostat is large. **Note that if your Emergency Heat light is on but your thermostat is NOT set to Emergency Heat, this is an indicator there’s a problem with your heat pump and you should call for advice and service. 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. If you live in colder states with harsh winters, the outside temperature can mess with your heat pump. When the heat pump can no longer maintain the desired temperature setting, then the … If there's a wire in the W1 connector, make sure it says AUX heat. The Emergency Heat Setting is Engaged. This secondary heat source is typically electric heating coils integrated into the system. EM heat is an option on your thermostat that you can manually turn on to activate backup heating. 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. 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 us at Jackson & Sons at 919-734-9611. Auxiliary heat uses electric resistance heating, which is much less efficient than your heat pump. This switch allows homeowners to turn on AUX heat manually. In aux mode, your heat pump will continue to use outside air to warm your home to assist the secondary heat source. Heat pumps need a supplemental heating source. On the other hand, your emergency heat takes over, or replaces, your heat pump’s heat. 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. Select “Heat Pump”. If you live in an area when the temperature hardly ever goes below 30 degrees, even at night during the coldest month of the year, then a … Auxiliary heat is automatically activated when there’s not enough outdoor heat. Auxiliary heat is the electric heat strip in your air handler that is supplemental heat. Terms & Conditions | Privacy Policy | Sitemap | Design & Marketing by LeadsNearby, What All New Homeowners Should Know About HVAC, Duct Efficiency Is Key for Running Your HVAC Unit, Make Sure Your HVAC Insulation Is Working the Right Way, From Heating to Cooling: To-Do Before Turning on Your Air Conditioner. This system is activated manually by a button/switch on your Thermostat. The thermostat will only run the Emergency Heat when the thermostat’s system switch is moved to the Em Ht position. The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. What Is Emergency Heat? Emergency heat is a mode the user manually selects if the unit is not providing any heat for some reason such as a malfunction. For example, if your house is not warm and it’s because something has happened to your outdoor unit, then it’s time to turn Emergency Heat on and call for service. If the heat pump ices over, AUX heat will kick in more often, in order to compensate and raise the temperature to the desired levels. 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. Note: If Alt heat (not AUX heat) appears, your Nest Thermostat E is configured to work with a dual fuel system. The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. ** Auxiliary Heat. When switching your unit to emergency heat, you’re forcing the backup heat system to do all the work. Both “auxiliary” and “emergency” heat have to do with the operation of these electrical strips. The important thing to remember is that “AUX” heat is fast and dependable but it’s also more expensive than heat … The defrost mode stays on. Our professional team of technicians look forward to providing energy efficient and cost effective solutions to keep your home or business comfortable at all times. You won’t find an option to use Emergency Heat, but your thermostat will automatically use alternate heat when needed. This is for those times when your heat pump outside unit is not working and you don’t want to risk damaging it more. Emergency Heat is typically triggered when it is 35°F and below outside. 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. This will save you money in the long run. As the name itself suggest, emergency heat is meant to be used in an emergency. So when should you use your Emergency Heat? The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. Auixiliary Heat will turn on automatically when heat can no longer efficiently transfer heat from the outside air to heat pump. (See this article about refrigerant Leaks) Emergency Heat is just the switch setting that will turn off the heat pump and only run the auxiliary heat. As outdoor temperatures rise and secondary heat is no longer required, the unit automatically turns off the auxiliary electric coils. The Emergency Heat Switch on a Heat Pump confuses a lot of people. 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. This setting turns off the heat pump completely and should only be used during an emergency. When do I use it? Signs that your auxiliary heat is not operating correctly: The auxiliary heat does not turn off when you lower your thermostat. Especially when the weather is below 40 degrees. Note that auxiliary heating is not the same thing emergency heating (displayed as “EM HEAT” or “EMER” on most thermostats). When winter temperatures plunge, at some point your heat pump may require either auxiliary heat or emergency heat to keep the house warm. Both of these wires are needed for Emergency Heat. Heat) on will turn off the heat pump and run the auxiliary heat only. It does need to be noted, if your thermostat stays in “Aux Heat” even when temperatures outside rises, you should call to have it serviced. It’s used when there’s something wrong with your “first stage” heat. 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. Along these same lines, the auxiliary heat may come on if the unit has been running for ten to fifteen minutes without any change in the temperature of your home. We are always here to help as much as we can! The outdoor temperature where this occurs varies according to the efficiency of each particular heat pump, but it’s typically below 40 degrees. What is it? Therefore, a heating system stuck in AUX heat will run up an energy bill. This setting is genuinely for emergency use only. The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. Emergency Heat is when you use your supplemental heat (2nd stage) by itself, without the use of your heat pump (1st stage heat). Instead, they extract latent heat energy in outdoor air, concentrate it, then circulate it through the home’s ductwork. 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. Having Emergency Heat on can and will be more expensive to run. If outdoor temperatures temporarily drop and your heat pump can no longer extract enough heat, the proper mode is automatic auxiliary heat. The reason your thermostat has aux heat is that it indicates when gas or electric power has been triggered to help your heat pump reach a warm enough temperature when the weather outside is extremely cold. Heat Pump Stuck in Aux Heat Mode The auxiliary heat setting is more energy and cost-efficient than emergency heat. **Note that if your Emergency Heat light is on but your thermostat is NOT set to Emergency Heat, this is an indicator there’s a problem with your heat pump and you should call for advice and service.**. External Factors That Can Initiate AUX Heat. In this mode, the heat pump still contributes as much heat as possible, minimizing demand from electric heating coils. Your heat pump only is the “first stage” heating. Auxiliary heat on the other hand uses heat strips together with the heat pump to supplement the loss of heat. Virtually all heat pump stats, no matter the age, have both an Emergency switch and an automatic Aux mode (although with older stats, the control logic that activates Aux may be poorly implemented). Do I turn it on when it’s really cold? Essentially your Auxiliary heat is called in as reinforcements for your heater when it is being overwhelmed until things return to a manageable state. The emergency heat setting on your thermostat is set to on. As long as you are comfortable in your home, there is no need to manually switch on your heat pump’s auxiliary or emergency heat switch on your thermostat or control system. Change to the desired value. Make sure that you only use the emergency heat feature as temporary solution and not a long-term solution. However, it’s important to understand that this setting turns off the heat pump completely. Emergency heat activates the secondary heat source to provide … The short answer is that auxiliary heat and emergency heat refer to the same thing, and are somewhat interchangeable. Down to a certain temperature, there’s sufficient latent heat in cold air to maintain indoor temperature settings. Is auxiliary heat the same as emergency heat? Emergency Heat is when you use your “second-stage” (supplemental heat) by itself without using your “first stage” (heat pump). Electric heat strip - This electric heat strip is auxiliary heating (or “aux heat” as it shows up on your thermostat). Aux on the thermostat stands for auxiliary heat. Both forms of heat are the exact same heat elements but are labeled differently. 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. 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). When you turn on Emergency heat, this will only turn on the indoor unit and back-up 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). Emergency heat setting is turned on. As outdoor temperatures rise and secondary heat is no longer required, the unit automatically turns off the auxiliary electric coils. Heat pumps don’t generate heat with a burner flame like a gas-fired furnace. Select “Settings”. In other words, it only uses the secondary electrical or gas system for heating. If you think your heat pump is broken, it’s best to get it fixed as soon as possible. I figured out the B was really a C but from the Nest website it wasn’t clear if a heat pump with aux electric heat was considered a dual fuel or … You should verify that the X wire on the old thermostat is not a common wire. 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. It is common that the Emergency heat and auxiliary or backup heat is the same source of heat (electric heat strips or fossil fuel). When activated, it is indicated on the digital display. Emergency heat activates the secondary heat source to provide 100% of required heat. It becomes necessary once the temperature drops below a certain point. 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. While they do allow you to continue to get the heat you need in your home to stay both comfortable and healthy, they do cost quite a bit more to run for longer periods of time, which is … Exactly as the name implies, in emergency situations only. For more about understanding the auxiliary and emergency heat mode for your heat pump, contact the professionals at Jackson & Sons. Some HVAC units have a toggle switch for emergency heat. In emergency mode, conversely, the heat pump function is totally disabled and the system relies entirely on secondary heating coils. Emergency heat is the same thing as auxiliary heat.
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