Knowledge Builders

why does auxiliary heat turn on

by Ludwig Pacocha Published 3 years ago Updated 2 years ago
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Here are a few reasons why auxiliary heating can turn on:

  1. The temperature outside is below 35° When outside temperatures drop close to freezing, it can be hard for heat pumps to keep up. ...
  2. You Increase the Thermostat Temperature By at Least Three Degrees It’s normal for AUX heat to turn on when your heat pump needs to heat the home quickly. ...
  3. The Heat Pump is Defrosting

Aux heat will kick on when your heat pump cannot deliver enough warmth to heat your home. Typically, your heat pump will energize the auxiliary heat strip inside your secondary heating source to help reach its set temperature faster.Oct 22, 2021

Full Answer

Is it bad if auxiliary heat comes on?

Unfortunately, using the auxiliary heat is significantly more expensive than using your heat pump. It may be more effective, but it comes with a specific cost that you might not be anticipating. If your heat pump for the auxiliary heat is always on, expect to see higher electric bills.

What does it mean when auxiliary heat keeps coming on?

Often, the auxiliary heat is coming on because the temperature in the home is set too high. Perhaps you feel most comfortable in the mid-seventies, but the air outside is dipping below freezing. Your outdoor heat pump is unlikely to be able to hold up under these demands.

What does auxiliary heat mean on my thermostat?

Auxiliary heat is a secondary heating function your thermostat automatically switches to when it’s too cold outside for your heat pump to extract warmth from the air. This type of heating is often triggered when the outdoor temperature drops to 35 degrees or below.

Why does my heater only blow out cold air?

Why is my electric heater blowing cold air?

  1. Dirty Filters. People usually do not think about cleaning their heaters of all things. ...
  2. Thermostat settings. Most electric heaters have dual settings, and if your heater blows both cold and warm air at different times, you should check your thermostat.
  3. Furnace problems. ...
  4. Ductwork. ...

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How do I stop my auxiliary heat from coming on?

The easiest way to stop the auxiliary heat from coming on is making sure the temperature doesn't drop too fast. You can do that by adding more insulation to your home and closing doors to rooms you aren't using. Taking proper care of your HVAC system can also help.

Does auxiliary heat come on automatically?

Auixiliary Heat will turn on automatically when heat can no longer efficiently transfer heat from the outside air to heat pump. This is when the outside is around 35-40 degrees and the indoor temperature is around three degrees cooler than the thermostat setting.

How often should auxiliary heat come on?

When should my auxiliary heat come on? When outside temperatures drop below 40 degrees. While undergoing the defrost cycle. When there is a 3 degree difference or more in the current temperature in your home and the thermostat setting.

How long can auxiliary heat run?

By default, this time is set to five minutes. This means, if your aux heat is called upon and canceled immediately, it will still run for five minutes before shutting down. If you change the threshold settings, you can configure the minimum on time and save on electricity or heating oil.

Why does my thermostat say auxiliary heat on?

When you see the “aux” heat indicator on your thermostat it means your heat pump needed some help reaching the desired temperature. It turns on automatically when the temperature falls about two degrees below the desired setting and turns off automatically when the target temperature is reached.

Does auxiliary heat cost more?

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.

Why is my auxiliary heat blowing cold air?

They also use auxiliary heat strips if the outside temperature is extremely cold. If these strips malfunction, the heat pump will blow cold air. Just like in the summer, the system requires the proper level of refrigerant. If the level is low, the heat pump cannot transfer heat efficiently.

At what temperature does a heat pump switch to emergency heat?

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.

How do I know if my auxiliary heat is on?

Here's how you can tell: It says so on your thermostat: The next time temperatures plummet, take a look at your thermostat. If the display says “AUX,” this means your heat pump is in auxiliary mode.

Should heat pump and AUX heat run simultaneously?

AUX heat refers to your heat pump's “backup” electric resistance heating. This heat setting should only kick on when the heat pump can't produce enough heat to warm your home or if your heat pump goes into defrost mode.

Why is my auxiliary heat blowing cold air?

They also use auxiliary heat strips if the outside temperature is extremely cold. If these strips malfunction, the heat pump will blow cold air. Just like in the summer, the system requires the proper level of refrigerant. If the level is low, the heat pump cannot transfer heat efficiently.

How do you know if your emergency heat is on?

Emergency Heat Mode Comes with a Red Indicator Light: When you turn your emergency heat on, you will see a red indicator light. This light tells you that your HVAC system is now operating in emergency mode, and it will remain on until you deactivate your emergency heat.

What is auxiliary heat?

Basically, auxiliary heat uses electric resistance heating to heat your home. Since electric resistance heating is much less efficient than your heat pump, you only want it to be on when necessary. Otherwise, your auxiliary heat is working when it shouldn’t be and driving up the cost of your heating bill.

What Is Auxiliary Heat and What Does It Mean for Your Heater?

Has your heating system been stuck on aux heat? Perhaps your heating system isn’t working as effectively as it should be? Finally, has your heating bill been outrageously high over the past month? Thanks to our Aspire experts, you don’t have to wonder what is auxiliary heat and how to fix it. Hence, if you do have an aux heat issue, let us take care of it for you.

How to contact Aspire Heating and Cooling?

Are you looking for the right HVAC expert to be your new go-to resource? Call Aspire Heating & Cooling at 336-281-0047 and be on your way to improved indoor comfort in no time.

When should auxiliary heat be turned off?

Down here in the south, that should mostly happen at night and during the occasional snowstorm. However, if the weather is warmer and above the freezing level , your auxiliary heat should automatically turn off. If it doesn’t, then you’ve got a problem. So, don’t wait and run the risk of a complete system breakdown or a high heating bill. If your heating system is stuck on aux heat, call Aspire today.

Does Aspire do heating repairs?

In addition to heating repair, Aspire also does heating system installation and regular maintenance. Thus, if your heating system decides to bite the dust, let us professionally install a brand-new heating system for you. Lastly, the best way to prevent a system failure is with regular maintenance. This service allows us to regularly check your system and its equipment to ensure that everything is working efficiently. Therefore, stop the breakdowns before they happen with our fast and friendly routine maintenance. To learn more about any of our services or maintenance plans, call us at 336-936-9111. Keep your home heated this winter with the help of our professional mechanics.

Why Would Auxiliary Heat Come On?

Auxiliary heat will turn on when the weather is cold outside so that you’ll be able to stay warm. This unit provides supplemental heat to make sure your home is nice and cozy during colder months, so it would help to activate it if you need some extra warmth.

Why Is My AUX Heat Blowing Cold Air?

If your auxiliary heat is blowing cold air, then there’s a good chance something is wrong with it, and it isn’t working correctly. It’ll need to be serviced to get back up and running, but make sure you also make some HVAC repairs.

What Does Aux Heat Mean on My Thermostat?

Aux heat on a thermostat means there’s a secondary heating system to provide warmth when the weather outside gets cold. Typically, auxiliary heat turns on automatically when it gets too cold outside for your regular heating to be effective.

Why does my thermostat keep auxiliary heat on?

Newer thermostats may cause the auxiliary heat to come on more quickly than older ones. If the temperature does not pick up within the first few minutes, many of the new models will prompt the aux heat setting.

Why does my heat pump have aux heat?

Basically, if your heat pump is struggling to maintain its goal temperature, your aux heat will turn on and give your heat pump a boost. Aux heat will kick on when your heat pump cannot deliver enough warmth to heat your home.

What Does Aux Heat Mean?

Auxiliary heat on your thermostat refers to your backup heating system within your heat pump, otherwise known as electric resistance heating. Your thermostat inside your house is actually what determines when the auxiliary heat gets turned on.

Why is my thermostat stuck on aux heat?

As we’ve talked about before, this is because their HVAC system simply can’t keep up with a reasonable demand to heat the home. This is a serious issue that will likely need to be seen by an experienced HVAC technician.

Why does my heat pump turn on when it's freezing?

During freezing weather, the outdoor heat pump will be too cold to quickly heat your home, which is when the auxiliary heating system would kick on. Auxiliary heating turns on automatically to help heat your home more quickly if the temperature drops suddenly.

What does it mean when a heat pump is on?

If you see the indicator is on, it means your heat pump’s electric resistance heating is activated.

Why is emergency heat only used in emergencies?

Having emergency heat on can, and will be, more expensive to run. This is why it is only used in an emergency situations.

What is auxiliary heat?

Auxiliary heat is a secondary heating function your thermostat automatically switches to when it’s too cold outside for your heat pump to extract warmth from the air. This type of heating is often triggered when the outdoor temperature drops to near or below-freezing temperatures.

How long does it take for an auxiliary heat to turn off?

Auxiliary heat should be a temporary setting and automatically turn off once your home warms up. Check back in 30 minutes or so to see if it has turned off on its own.

What does the aux light on my thermostat mean?

An indicator on your thermostat should alert you when your heating has switched to auxiliary heat. This can be in the form of a small aux light or a digital reading that says “aux heat” on your display.

Why does my heat pump get iced?

This type of heating is also activated if your heat pump becomes covered in ice or snow. Ice can form when there is a problem with your heat strips, which work to keep your equipment defrosted. Another trigger could be low refrigerant levels or a malfunction in your outdoor motor fans.

How does a heat pump work?

A heat pump warms your home by pulling in heat from the outdoors, but it can also cool your home by expelling heat from your living space to the outside. Heat pumps don’t create heat or cold air by themselves. They transfer the warmth or coolness from one place to another.

Why does my heat pump turn on when it's in defrost mode?

Auxiliary heat will also turn on when your heat pump goes into defrost mode. It does this to prevent blowing cold air into your home while the outdoor condenser is thawing.

When does an auxiliary heat pump automatically turn off?

Auxiliary heat will automatically turn off when your home or environment has warmed up enough for your heat pump to function normally. Remember, your emergency heat is not automatic and will require you to physically turn it on and off.

Why does my aux heat come on?

Oftentimes, the aux heat is coming on because the temperature in the home is set too high.

What does auxiliary heat mean on a Honeywell system?

What does aux heat mean on a Honeywell system? Short for auxiliary heat, this system is designed to heat your home up quickly instead of waiting for the cold heat pump on the exterior of your home.

How long should you keep your auxiliary heat on?

Auxiliary heat only turns on when your home needs warmth fast. It should only remain on for as long as it takes your home to reach the temperature on your thermostat.

Does every Honeywell Thermostat have auxiliary heat?

Not every Honeywell Thermostat has an auxiliary heating feature. This function is only really used in HVAC systems that rely on heat pumps. Not all Honeywell models use this type of technology.

Will any system let me just turn off my auxiliary heat?

No, unfortunately, there are no thermostat brands that let you turn off auxiliary heat manually. That’s why it’s important to maintain your system properly so that AUX heat doesn’t constantly need to turn on.

What happens if your heat pump is always on?

If your heat pump for the auxiliary heat is always on, expect to see higher electric bills. Many homeowners would prefer to learn how to stop their auxiliary heat from coming on at all. Learn more about what to do if your aux heat keeps coming on this winter.

Why should an auxiliary heat pump run more often?

The auxiliary heat pump should run more often when the temperatures outside dip below freezing. This is because your outdoor heat pump will have a more difficult time creating enough warm air to heat your home. Homeowners who notice their auxiliary heat rise as the temperatures drop may not have a reason for concern.

The Basics of the Heat Pump

To better comprehend auxiliary heat, you need to have a detailed understanding of the electric resistance heat strip. When the climate condition is moderate and requires a reliable heating solution, the heat pump becomes the most efficient and reliable option available.

How Does a Heat Pump Work?

The heat pump works through heat transfer and heat absorption. Heat transfer is the cheapest and efficient mode of heating. When the pump cannot attain the heat level of heat required, it taps into its backup plan, the auxiliary heat. It varies from one homeowner to another. Some people use their auxiliary source as electrical resistance heating.

Auxiliary Heat on a Thermostat

Most people tend to wonder what auxiliary heat features on the thermostat. The reality is that this is the primary indication of heat supply. The fundamental responsibility is to transfer or to pump heat. When the temperature range falls below 32 degrees, the auxiliary heat turns on automatically. This is mainly caused by;

When Should You Be Concerned About Auxiliary Heat?

When the temperature in the outside environment begins to warm up and the auxiliary heat is still on, then there is a problem. At this point, you need to call in a certified professional to help you sort out the problem. The heat pump relies on the use of electric resistance to heat and cool your home.

How To Prevent the Heat Pump From Using the Auxiliary Heat Function

As stated earlier, when the auxiliary heat function is on, it consumes a lot of energy, thus leading to increased electricity bills. Having a function of managing this situation is essential, especially when it comes to energy bills. The tips discussed below can help you to manage the auxiliary heat function.

FAQs

Answer: Auxiliary heat uses electric resistance to warm the house when the temperature is too low. This indicates that it consumes more energy when compared to heat transfer. When your heat pump gets stuck to auxiliary heat, always know that your electricity bill is also skyrocketing.

Final Verdict

Auxiliary heat is a common term whenever you talk about the heat pump or any other mechanism of heating your home during cold weather. The term revolves around a wide variety of aspects revolving around the functionality of the heat pump. This article incorporates tons of information that helps you manage auxiliary heat on your heat pump.

Why does my auxiliary heat work?

Typically, your auxiliary heat is triggered by the environment or other causes like an issue with your heating system.

How Do I Turn Off Auxiliary Heat?

If you do not want your system using the auxiliary heat source, it can be programmed to turn off or change when it toggles on to a more manageable level.

What is the Difference between Auxiliary Heat and Conventional Heat?

There is quite a difference between your conventional heat and your auxiliary heat. Auxiliary heat is a supplemental heat source in addition to your conventional heating.

How Long Does Auxiliary Heat Stay On?

Your auxiliary heat will stay on for as long as it needs to. How long the auxiliary heat depends on how your system is set and what the environment is like.

Is it Better to Use Auxiliary Heat?

Auxiliary heat is an excellent supplemental heat source. It is not intended for long-term use, and the more you use it, the more expensive your heating bill will be overall.

Is Auxiliary Heat the Same as Emergency Heat?

Auxiliary heat and emergency heat are very different but use the same system to distribute heat.

How Do You Know if Your System Can Keep Up with the Heat Demand?

Much like an air conditioner, your heater or furnace can only pump out so much heat.

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1.Why Does Aux Heat Keep Turning On? - Precision HVAC

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