The main difference is that the auxiliary heat is a backup or supplement to your conventional heating or external heat pump. Both will be running simultaneously; the auxiliary kicks on to help the external heat pump out. When emergency heat is toggled, it sometimes turns the external pump off and only uses the heater’s interior system.The best insulin pumps are easy to customize to your specific needs, and offer safety features like clocks and alarms. Check out this guide to choosing the best insulin pumps, and ...Wyze Thermostat With Heat Pump. not-phone-specific, thermostat. rkthomas65 December 20, 2020, 2:41pm 1. I am thinking about buying the Wyze Thermostat but had a question about Emergency and AUX heat. My current Thermostat displays when the unit is using Aux Heat if it is too cold outside and …Use the following steps to put your heat pump into Emergency Heat Mode. Step 1: Press System Mode. Step 2: Press System Options. Step 3: Press Enable Emergency Heat, then select Done. Step 4: Once the temperatures are above freezing, do the same 3 steps, but select Disable & Done to put the system back …What distinguishes Emergency heat from auxiliary is that while auxiliary heat will automatically turn on when your heat pump is not keeping up, emergency heat is manually turned on when the heat pump is not working or when it is not keeping up with heating. PS: Note that Emergency heat is an expensive …When switched to emergency heat, a red indicator light will go on. It stays lit until emergency heat is turned off. Typically during emergency mode, only the indoor unit and supplemental heat source will run and your outdoor heat pump unit will not function. When installing a heat pump, make sure that you are in a region where the weather …Learn how to use the emergency heat setting on your thermostat when your heat pump is broken, iced over, or unable to maintain a safe indoor temperature. Find out the …Aux (Auxiliary) Heat is available only for heat pump equipment that supports it. Aux Heat is heating that is generated by a secondary (i.e. auxiliary) heat source. The auxiliary heat source is generally less cost efficient than the heat pump. Therefore it is only used when necessary to reach a desired set point while in Heat mode.T4H5S. Ion™ Heat Pump. This high-efficiency heat pump can be used with a fan coil or paired with a compatible furnace and control for dual fuel heat savings. Cooling Efficiency Up to 15.2 SEER2 / 12.5 EER2. Heating Efficiency Up to 8.1 HSPF2. Sound As low as 68 decibels. Compare. T5H6S. Ion™ Heat Pump.Jan 22, 2014 ... When Should I Switch My Heat Pump Thermostat to Emergency Heat? [FAQ] ... Short answer: You should only set your heat pump's thermostat to “ ...Typically, a heat pump will switch to emergency heat when the temperature drops below 30° Fahrenheit, but it can also switch over due to other factors that we ...Emergency heat is a mode that you can turn on automatically or manually. Heat pumps go into this mode when temperatures drop too low. When this happens, it needs the help of a secondary heat source. So, the heat pump will turn off and an electric resistance heater or a gas furnace takes over.If you’re in the market for a heat pump, you’ve probably come across the Evoheat Evo270. Known for its energy efficiency and reliable performance, this heat pump is a popular choic...Every code I've seen names the acceptable methods for sizing heating/cooling. While this code requirement is often ignored, in this case it can be your friend in avoiding unnecessary devices. The thing that irks me about this more so than the apparent price gouging and perpetuation of misconceptions of cold climate heat pumps, … As its name implies, you should only switch to emergency heat on the very coldest days to prevent damage to your heat pump. Your heat pump is broken, and you're awaiting emergency repairs. Your heat pump is iced over or unable to maintain a safe indoor temperature level. Remember, your backup heat source may be more expensive than your heat ... Updated Nov 20, 2023. 12 min read. Based on an EnergySage analysis of a Department of Energy database, a typical heat pump in a typical home uses 5,475 kilowatt hours (kWh) per year—easily the single biggest energy-user in most houses. That’s enough electricity to run nine full-size fridges year round, or power a Tesla Model 3 for 15,000 miles.Emergency heat is a secondary heating source that can be used when your heat pump freezes over or breaks down. It works by bypassing the heat pump and using electric, gas or oil furnace. Learn when to use it, how it works, and how much it costs.Stomach pumping is also known as gastric lavage or gastric suction and is a procedure that empties the content of a person’s stomach during an emergency. The procedure is common fo... As its name implies, you should only switch to emergency heat on the very coldest days to prevent damage to your heat pump. Your heat pump is broken, and you're awaiting emergency repairs. Your heat pump is iced over or unable to maintain a safe indoor temperature level. Remember, your backup heat source may be more expensive than your heat ... Clearing the snow 2-3 feet around your heat pump is necessary because the heat pump heating system is designed to draw air from all sides of the outside unit. Having all sides clear of snow allows the air to freely reach the heat pump. As a result, this will alleviate strain on the system and your heat pump will operate efficiently.In extremely cold weather, your HVAC system switches to ‘Emergency Heat‘ mode. This shifts heating from a heat pump to an electric furnace. Emergency Heat should only be used when outdoor temp drops below 32°F. The electric furnace is less energy efficient, so use it in emergencies only.1. Check the Thermostat and Turn it Off. If you have to reset your heat pump because it keeps running off on its own or doesn't perform the desired function, the first step is to check the settings on the thermostat and adjust them accordingly. A heat pump serves two purposes - to warm up or cool your space.1. Check the Thermostat and Turn it Off. If you have to reset your heat pump because it keeps running off on its own or doesn't perform the desired function, the first step is to check the settings on the thermostat and adjust them accordingly. A heat pump serves two purposes - to warm up or cool your space.Heat pumps are so efficient that even if you need to raise the thermostat a degree or two on the worst winter days, you will still be better off in the normal heating …Honeywell 1st Stage Heat Pump With Auxiliary/ Emergency Heat (7 wire) This is also known as a 7 wire honeywell thermostat wiring. A first stage heat pump system will have 1 compressor hence only 1 Y wire. This is the wire that controls the first stage compressor relay. In addition to the OB/ wire and R wires, you will have an Aux/E wire.Switch to emergency heat. Yes it’s more expensive but you heat pump can’t keep up in these cold temperatures and emergency / aux heat is running anyway. So save yourself a little money by shutting off the heat pump and using emergency heat.Digital Non-Programmable Thermostat,1H/1C, T21STK-0 Digital Heat/Cool Pump Thermostats,24 Volt Single Stage Thermostat for Room White. 311. $2099. List: $22.99. FREE delivery Thu, Feb 8 on $35 of items shipped by Amazon.Learn what emergency heat is, when it comes on, and when to switch to it from your heat pump. Find out the benefits and drawbacks of using emergency heat, and how to …These supplemental heating sources are known as “second-stage” or “back-up” heating. The “first state” heating is the heat pump itself. Emergency heat is when you use your “second-stage” by itself without using your “first stage”. Explaining Emergency Heat. So when should you use your Emergency heat? In …Digital Non-Programmable Thermostat,1H/1C, T21STK-0 Digital Heat/Cool Pump Thermostats,24 Volt Single Stage Thermostat for Room White. 311. $2099. List: $22.99. FREE delivery Thu, Feb 8 on $35 of items shipped by Amazon.You can choose how much AUX heat your system will use when your heat is running. AUX heat can cost about 2 to 5 times as much as running your heat pump. Heat Pump Balance lets you select a level of comfort and savings you like: more comfort, more savings, or a balance between the two. You can change this option …Quality temperature control with convenient features. Retains memory in the event of a power outage. Emergency and auxiliary heat +/- indication. System modes include: Cool, Off, Heat, and Emergency Heat. Dimensions: 5.4" W x 3.75" H x 1.25" D. DIY installation.No matter what kind of heat pump you have, the switch between using the heat pump and using the backup heating source is done completely automatically by the system. What is a heat pump’s emergency heat setting? Emergency heat is a setting on a heat pump’s thermostat that can be used instead of the normal “heat” and “cool” modes.Have you noticed that the price at the gas pump seems to change almost every day? You never know if the price when you need to fill up will be good, great, or awful. You might also...Nov 27, 2019 ... During an extended extreme cold spell, our primary heat pump may even quit working all-together. This is when your emergency heat system can be ...Jun 10, 2023 · Heat pumps are an energy-efficient way to heat and cool a home, but they may switch on emergency heat in certain situations. Extreme cold temperatures, incorrect sizing for the climate, damage to components inside the compressor unit, freezing rain, and total system failure can cause a heat pump to trigger emergency heat. The heat pump emergency heat setting, usually seen as "em heat" on a digital thermostat, is used when the heat pump needs a break to avoid system damage. It is also helpful in warming your home in ...Note that a heat may have emergency heat and auxiliary heat. They typically both utilize secondary heating such as heat strips. While the heat pump will automatically switch to auxiliary heat when the temperature falls below the compressor lockout. You are required to manually switch your heat pump to emergency heat when you need it. Final …The EM—short for "emergency heat"—setting on your thermostat that controls the emergency backup heating system that can be turned on if the primary heating system for the home fails. Having an emergency heat thermostat setting means you likely have a heat pump as well as a backup system such as gas, oil, electric, or hot …The emergency heat mode is designed to activate automatically when the heat pump cannot maintain the the temperature in your home. CALL OR TEXT 24/7 - (720) 468-0689 FacebookThe emergency heat setting is a third-level backup heat source that kicks in when your heat pump can’t draw in outdoor air and heat it (like it typically does) or rely on the secondary heat source, which is usually electric heat or a furnace. If both primary heat sources fail for some reason, that’s when you turn to the emergency heat setting.The heat pump’s “emergency heat” mode, on the other hand, only uses these methods of heating the home when it cannot efficiently maintain your desired temperature within the home on its own. By manually intervening, you will likely decrease your home’s heating system’s efficiency, thus resulting in a high …Quality temperature control with convenient features. Retains memory in the event of a power outage. Emergency and auxiliary heat +/- indication. System modes include: Cool, Off, Heat, and Emergency Heat. Dimensions: 5.4" W x 3.75" H x 1.25" D. DIY installation.Jan 16, 2024 · Emergency heat (EM) in a heat pump system is the backup heating method. Typically, when a heat pump is in heating mode, it pulls in heat from the outside. When the temperature drops the outdoor air is too cold to draw in heat, and the heat pump efficiency drops. The government has ambitions for the installation of 600,000 heat pumps a year by 2028. Sky News has reported apparent divisions among ministers in the …When the emergency heat is on, your heating system will shut down the heat pump and stop trying to extract hot air from the outside air. Bypassing the heat pump function will enable the home to …Mar 20, 2021 · When the emergency heat is on, your heating system will shut down the heat pump and stop trying to extract hot air from the outside air. Bypassing the heat pump function will enable the home to use it’s auxiliary heat system; oil/gas furnace, or electric heat strip. If you have an electric system, this can become costly the longer you keep ... Emergency heat is equally as efficient as space heaters, but it is safer. Space heaters start many fires [when not used properly]. But, if you use your space heater only in a single room, it will use much less electricity than emergency heat because emergency heat would be heating the entire house. If you want to just keep a single room warm ...Call us at 1-800-642-4419 for fast, reliable emergency HVAC and Plumbing services! Find your local Horizon today! Horizon Services is proud to offer 24/7 emergency HVAC repair services and we never charge extra …Emerson Honeywell Home Lux ProSelect Winchester 3 4 5 Central Air Conditioning Heat Pup (No Aux.) Heat Pump (No EM) Heat Pump (With Aux.) Heat Pump (with EM) Hot Water Steam or Gravity Warm Air Furnace Touchscreen Temporary Vacation Mode High/Low Temperature Limits Filter Monitor Backlit Display iOS Google Assistant …I'm coming from a traditional Honeywell thermostat with a heat pump and I've got the following wires. R - Power. C - Common. G - Fan. O/B - Reversing valve. Y - Compressor. AUX - Aux heat (i.e. heat strips + heat pump) E - Emergency heat (i.e. heat strips only) Ecobee's setup told me to cap the E wire as it's not used.The heat pump emergency heat setting, usually seen as "em heat" on a digital thermostat, is used when the heat pump needs a break to avoid system damage. It is also helpful in warming your home in below-freezing temperatures. Just remember, this emergency heat mode will continue to run until you manually turn it off.Jun 10, 2023 · Heat pumps are an energy-efficient way to heat and cool a home, but they may switch on emergency heat in certain situations. Extreme cold temperatures, incorrect sizing for the climate, damage to components inside the compressor unit, freezing rain, and total system failure can cause a heat pump to trigger emergency heat. These heat strips use traditional electric heating elements to produce heat, similar to a toaster or space heater. Emergency heat provides a backup when it is too cold for the heat pump alone. But it is an expensive heating option, since electricity costs more than gas or oil heat. Minimizing reliance on emergency heat is crucial for efficiency. Keeping your thermostat on emergency heat when temperatures exceed 35F is a waste of energy. Once temperatures reach below 35F, your heat pump may begin to struggle. In a worst-case scenario, it may even break. At this point, emergency or aux heat will enable damage to your HVAC system. This will also help keep your household warm …Here are the top 10 heat pump questions common with homeowners: 1. How can I tell if my home has a heat pump or an air conditioner? A heat pump and air conditioner can look nearly identical. However, there is a simple way to determine if you have a heat pump. Turn the “heat” ON at your thermostat or control system.Oct 14, 2022 · Auxiliary vs Emergency Heat. Auxiliary heat (aux heat) is an additional heating component to a central heating system using an air-source heat pump. Aux heat provides extra heat alongside the heat pump when the pump can’t draw enough heat from the air outside. This occurs when the weather drops into the mid-30s Fahrenheit – and definitely ... If you used emergency heat regularly instead of your heat pump to combat chilly temperatures, your electric bill would drastically increase. For example, if you were to use your standard heat pump in 30-degree weather for 12 hours a day, seven days straight, at $0.13 per kWh, it would cost $32.76 for the entire week.Jan 15, 2024 · In most cases, you must manually turn on the emergency heating system. The auxiliary system automatically switches on when the heat pump becomes inefficient in colder temperatures. In freezing temperatures, the supplementary (auxiliary) heat turns on at about 35°F (1.7°C). An electric resistance heating element is an auxiliary heating system. Here is how you activate your emergency heat: Your thermostat should have a setting labeled “Emergency” or “E” When you find this setting, manually switch your thermostat so that the emergency heat setting is on. Immediately call Flame Heating and Cooling to send a service technician to fix …IDS Light - Inverter Ducted Split Heat Pump. Achieves up to 16.0 SEER and 9 HSPF. Delivers sound levels as low as 59 dBA. Combines the standard efficiency BOVA15 outdoor unit with our BVA15 fixed-speed air handler. Can be paired with Bosch ceiling and wall-mounted air handlers. More details.The best insulin pumps are easy to customize to your specific needs, and offer safety features like clocks and alarms. Check out this guide to choosing the best insulin pumps, and ...The electric emergency heat will cost 2x the cost of running the heat pump, although if the heat pump isn't keeping you warm because the outdoor temps are so low that the heat pump can't keep up, that is exactly why the emergency heat was installed...for those particular times when the heat pump can't keep up with …That is 370% efficiency. At much lower temperatures – say 10°F winter temperatures – an average heat pump efficiency is about 2.3 COP. That is 230% efficiency. Relatively speaking, we will see that a heat pump at 10°F will produce 38% less heat than at a higher 45°F temperature. Let’s say that we have a 24,000 BTU heat pump.As its name implies, you should only switch to emergency heat on the very coldest days to prevent damage to your heat pump. Your heat pump is broken, and you're awaiting emergency repairs. Your heat pump is iced over or unable to maintain a safe indoor temperature level. Remember, your backup heat source may be more expensive than …Oct 16, 2023 ... Heat Pumps and Electric Home Heating - Emergency heat not working - Could anyone offer a tip on how to diagnose an emergency heat problem?1-48 of 251 results for "honeywell thermostat with emergency heat" Results. Price and other details may vary based on product size and color. Overall Pick. ... Honeywell TH2210DH1000 Horizontal PRO 2000 5+2 Day Programmable Heat Pump Thermostat - Backlit, 2H/1C, Dual Powered. 4.5 out of 5 stars 21. $68.04 $ …Here is how you activate your emergency heat: Your thermostat should have a setting labeled “Emergency” or “E” When you find this setting, manually switch your thermostat so that the emergency heat setting is on. Immediately call Flame Heating and Cooling to send a service technician to fix …80 Series, 7 Day Programmable, Heat Pump (2H/1C) Thermostat. Add to Cart. Compare. New $ 139. 00 (145) 7-Day Smart Programmable Thermostat for Mini-Split Heat Pumps and Air Conditioners. Add to Cart. Compare $ 119. 05. King Electric. Low Voltage 5-1-1-Day Programmable Thermostat 24-Volt LCD Display White. Add to Cart.Oct 19, 2022 ... If connected to the " W1 " lug on the thermostat, it will control the backup as Aux Heat Automatically and turn it on if the heat pump can't ...Also, be sure that the emergency heat mode is not on. Dirty Air Filter. If the air filter is dirty or clogged, the heat pump will constantly run to keep your home comfortable. In order for the heat pump to run properly, ... Below are common reasons that the heat pump can become frozen in winter. Reason 1: The Unit Is …Jul 5, 2023 · Emergency heat (EM heat) is a backup heating mode that can be used when the heat pump system fails or to prevent damage to the heat pump during extreme weather conditions. The heat pump is bypassed when emergency heat is switched on, and the backup system generates the house’s heat. To better understand emergency heat, it’s helpful to grasp ... Aug 16, 2023 ... Electric resistance heat can use a LOT of power, so the rating of the various systems matters - e.g., if your heat pump uses a 30A breaker and ...Heat is just another word for thermal energy. Different kinds of energy can be converted into thermal energy. Most commonly, our homes are heated by turning electric energy (electricity) or chemical energy (oil furnace) into thermal energy. A heat pump works by simply moving existing thermal energy from one place to …Feb 5, 2023 · Auxiliary heat vs. Emergency heat: The key difference you should know. Depending on the type of thermostat you have, you may see a setting for emergency heat. This lets you turn on auxiliary heating at will. But it changes the way your system works. When you turn on emergency heat, it shuts off your heat pump completely. That means your HVAC ... Jan 16, 2024 · Emergency heat (EM) in a heat pump system is the backup heating method. Typically, when a heat pump is in heating mode, it pulls in heat from the outside. When the temperature drops the outdoor air is too cold to draw in heat, and the heat pump efficiency drops. Quality temperature control with convenient features. Retains memory in the event of a power outage. Emergency and auxiliary heat +/- indication. System modes include: Cool, Off, Heat, and Emergency Heat. Dimensions: 5.4" W x 3.75" H x 1.25" D. DIY installation.When the emergency heat is on, your heating system will shut down the heat pump and stop trying to extract hot air from the outside air. Bypassing the heat pump function will enable the home to … Emergency heat can mean one of a few things is happening, depending on how your HVAC system runs. This is a setting that you can turn on manually or that may come on automatically based on the circumstances outside. Simply, it’s a mode of heating your home to get you through an emergency. It is a vital setting that helps to keep your home ... Geothermal heat pumps use the earth around your home to move heat energy. Traditional air-to-air heat pumps use air circulated around the coils of the heat pump to move energy. On average, air-to-air systems and geothermal systems are comparable in price. Geothermal systems tend to be more efficient and can cost 35 to 50 … Select E: Emergency. The Emer. Heat option will now be available in the Equipment menu. If you there's no option for E: Emergency, the Nest thermostat does not detect an O/B wire. Emergency Heat is only compatible with Heat Pump systems. Check to make sure your O/B wire is fully inserted. Nov 18, 2015 · A heat pump is slightly less efficient in cold weather than it is in normal 20 to 30 degree winter weather, but it is never less efficient than the backup heat. So switching to Emergency Heat will always increase your bills. And most heat pumps will, in the normal heating mode, automatically use all the electric backup heat if necessary to heat ... When conditions are colder and freezing, the heat pump may not be able to provide enough heat. To provide the additional heat required, the auxiliary system ...The water pump on a Chevrolet Aveo with the 1.61 engine pushes the coolant from the radiator and through the engine block, ensuring that the coolant always circulates through the s...May 17, 2022 · The two most common emergency heat uses are when the heat pump has a mechanical failure or freezes up, and when the outside weather is too cold for the heat pump to adequately warm your home. Your heat pump will still run even if it can’t keep your home warm. They used to have an outdoor temperature gauge, an outdoor thermostat built into them. 1) Backup Heat is not engaging - check air handler breakers . Call for service if breakers trips again. 2) Defrost timer not set correctly and outdoor heat pump condensing unit is frozen - Call for service. 3) Incorrect control wiring or a problem with the control wiring. Call for service.Emergency heat is a mode the user manually selects if the unit is not providing any heat for some reason such as a malfunction. Emergency heat activates the ...The heat pump will also use emergency auxiliary heat in heat mode if the thermostat raises the temperature above 2°F. For example, if the outside temperature is 40 ° F, and the indoor thermostat reads 67°F, setting the thermostat to 74°F would engage the aux heat to assist in meeting the desired temperature of …
Jan 22, 2015 ... The emergency heating mode utilizes the same electric coils to generate heat as the supplemental mode. This mode is used only when a major heat .... Best shorts for runners
Heat is just another word for thermal energy. Different kinds of energy can be converted into thermal energy. Most commonly, our homes are heated by turning electric energy (electricity) or chemical energy (oil furnace) into thermal energy. A heat pump works by simply moving existing thermal energy from one place to …As its name implies, you should only switch to emergency heat on the very coldest days to prevent damage to your heat pump. Your heat pump is broken, and you're awaiting emergency repairs. Your heat pump is iced over or unable to maintain a safe indoor temperature level. Remember, your backup heat source may be more expensive than …Emergency heat (often referred to as “EM heat” or “auxiliary heat”) is a backup heating option available in HVAC systems that typically rely on a heat pump as a primary heating source. Typically, it is reserved for situations when your primary heating system fails or cannot provide sufficient warmth during extremely cold weather.Whether you’re looking for antique gas pumps from the 1880s or vintage versions from the 1930s, you’ll have fun hunting them down. They’re one of the most affordable items to colle...Best Heat Pumps. 1. Goodman. Goodman is a well-known brand in the HVAC industry and provides great energy-efficient heating and cooling solutions for homes large and small. They also have a strong heat pump rating and a decent warranty program to protect your system in case anything happens.Nov 17, 2023 · The selected projects are the first awards from DOE’s authorization, invoked by President Biden using emergency authority on the basis of climate change, to utilize the Defense Production Act (DPA) to increase domestic production of five key clean energy technologies, including electric heat pumps. Covered under President Biden’s Justice40 ... (the heat pump is cooled in heating mode by air blowing over that heat exchange coil attached to the furnace.) Ask Your Own HVAC Question. Customer reply replied 3 years ago. Filter was changed 9-1 Largest tube is warm. ... Does the emergency heat shut down the heat pump? ...The emergency heat setting in heat pumps is a critical feature designed to provide heating when regular heat pump functions are compromised. When activated, this setting brings about a fundamental change in how the heating system operates. It effectively shuts down the compressor, the heart of the heat …Aux (Auxiliary) Heat is available only for heat pump equipment that supports it. Aux Heat is heating that is generated by a secondary (i.e. auxiliary) heat source. The auxiliary heat source is generally less cost efficient than the heat pump. Therefore it is only used when necessary to reach a desired set point while in Heat mode.Your Heat pump probably has electric heat strips in the airhandler. When it gets too cold outside for the Heat Pump to efficiently bring enough heat into the house from outside (i.e. even constantly running no longer heats the house) the aux/emergency heat can be used to make sure you stay warm.Jan 14, 2021 · What is EM heat on thermostat settings? Short for “ emergency heat ,” it is a setting that controls your home’s back-up heating system. If you have an emergency heat thermostat setting, you likely have a heat pump, as well as a gas, oil, electric, or hot-water back-up system. Most systems have a heat pump as its primary setting and ... Goodman Heat Pump Emergency Heat doesn't work. I have a rather cheap Goodman heat pump. Last night temp got down to. 15F or so, so I turned the "Emergency Heat" on - it's a manual switch on the thermostat. The little red light came on, I smelled that funny lint burning smell that usually happens the first time it is turned on every winter.This is how a heat pump works. STEP 1. Liquid refrigerant is pumped through an expansion device at the indoor coil, which is functioning as the evaporator. Air from inside the house is blown across the coils, where heat energy is absorbed by the refrigerant. The resulting cool air is blown throughout the home’s ducts.A Carrier 15 Seasonal Energy Efficiency Ratio heat pump has a higher energy efficiency rating than a Carrier 14 Seasonal Energy Efficiency Ratio heat pump. The heat pump with a hig...Heating & Cooling. Heat Pumps. Designed for year-round comfort, a heat pump keeps you cool by drawing heat from your home on warm days and drawing heat from the outside air to keep you warm on cool days. That’s what makes our innovative, super-efficient heat pumps a great choice for families seeking a versatile heating and cooling solution.Jan 22, 2015 ... The emergency heating mode utilizes the same electric coils to generate heat as the supplemental mode. This mode is used only when a major heat ....