Knowledge Builders

what does emergency heat do

by Ettie King Published 3 years ago Updated 2 years ago
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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.Jan 14, 2021

Full Answer

When should I use my emergency heat?

When to use emergency heat. Emergency heat should only be used in emergency situations, like your heat pump breaking down or icing over. For example, if a snow-heavy branch snaps and crashes into your heat pump, use emergency heat while you wait for repairs. If your heat pump shorts out during an ice storm, go ahead and turn on your emergency heat.

Is emergency heat more expensive than regular?

Using Emergency Heat May Cause Higher Heating Bills: Emergency heat is more expensive than its traditional counterpart, so you will probably see a spike in your utility bills if you need to use it. You should use emergency heat for the shortest period of time possible.

How long can you run emergency heat?

While you can run emergency heat as long as you want, it’s extremely expensive. Therefore, you should use emergency heat sparingly and only as the name implies: during emergencies. What Is Emergency Heat?

Does emergency heat automatically kick on?

Your emergency heat setting automatically turns on when outside temperatures drop below a certain temperature, usually 30 degrees Fahrenheit. If you need to manually turn it on, you should call an HVAC professional to get your heat pump fixed.

What does emergency heat do?

When to use emergency heat setting?

What is emergency heat on your thermostat?

What to do if your heat pump freezes?

What happens when emergency heat is turned on?

How does a heat pump work?

Why do we need heat pumps?

See 4 more

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What happens when you run emergency heat?

Emergency heat=using the electric heat strip constantly OK, so when you turn your thermostat to emergency heat, your heat pump will stop trying to extract heat from outside to heat your home inside. Instead it will use ONLY the backup heat strip to heat your home.

When should I use emergency heat?

Emergency heat is ideal for when the outside temperature is too cold for your heat pump to keep your home warm. If the heat pump freezes over or becomes damaged, then you should switch to emergency heat and call an HVAC service provider.

What happens when you put your thermostat on emergency heat?

Switching your thermostat to emergency heat or “em heat” just because it's cold outside will just raise your energy bills like crazy. Don't use emergency heat mode unless your heat pump stops heating your home altogether. If that happens, contact a professional heat pump repairman for help.

Does emergency heat cost more to run?

Using Emergency Heat May Cause Higher Heating Bills: Emergency heat is more expensive than its traditional counterpart, so you will probably see a spike in your utility bills if you need to use it. You should use emergency heat for the shortest period of time possible.

Can I run emergency heat overnight?

So, to sum up everything that we just covered, emergency heat is not supposed to run the way that your regular heat setting does—and it is especially not meant to run all day and night during the long, frosty winter months.

Is it OK to run heat pump on emergency heat?

If you have an all-electric heat pump, then the answer is a definite Yes! It is much more expensive to run your heat pump on Emergency Heat. And as the name implies, should only be run in an emergency until your heat pump can be repaired.

How cold does it have to be for a heat pump not to work?

between 25 and 40 degrees FahrenheitHeat pumps do not operate as efficiently when temperatures drop to between 25 and 40 degrees Fahrenheit for most systems. A heat pump works best when the temperature is above 40. Once outdoor temperatures drop to 40 degrees, heat pumps start losing efficiency, and they consume more energy to do their jobs.

Will heat pump work below freezing?

At temperatures below -20°F, cold climate heat pumps still provide dependable heat, and many models are 100% efficient at sub-freezing temperatures. Since they consume less electricity in moderate weather, ASHPs cost much less to operate than legacy systems like combustion furnaces and boilers.

How much more expensive is emergency heat?

When operating in the auxiliary/emergency heating mode, that cost goes up to around $1.30 per hour. If your heat pump is operating in auxiliary/emergency mode without due cause (outdoor temperatures are above freezing or no drastic adjustment to your thermostat), it is possible that your system is malfunctioning.

Should I run emergency heat in an ice storm?

The emergency heat should only be turned on by the homeowner in emergency situations when something happens to the first stage heat source – your heat pump. For example, if during an ice storm a tree is knocked down and damages your outdoor unit, you should switch on your emergency heat and call an HVAC professional.

At what temperature should you turn on the heat?

That said, experts recommend turning on the heat when the indoor temperature is below 64 degrees Fahrenheit. If you have children, seniors, or people who are sick that threshold might need to be a bit higher. Set the thermostat lower when you go to bed.

What is the lowest temperature a heat pump will work?

Cold air has energy Arctic Cold Climate Heat Pumps are specifically designed to work in temperatures below freezing as low as -25C (-15F).

At what temperature do heat pumps become ineffective?

between 25 and 40 degrees FahrenheitHeat pumps do not operate as efficiently when temperatures drop to between 25 and 40 degrees Fahrenheit for most systems. A heat pump works best when the temperature is above 40. Once outdoor temperatures drop to 40 degrees, heat pumps start losing efficiency, and they consume more energy to do their jobs.

What is the lowest temperature a heat pump will work?

Common questions about heat pumps in cold weather Yes, air source heat pumps work below 20 degrees Fahrenheit—in fact, they can perform well below -10!

What's the difference between heat and Em heat on my thermostat?

EM HEAT is for emergencies only That's why EM HEAT, or emergency heat, is a manual setting. However, as soon as the heat pump turns back on or is repaired, you'll want to set the thermostat to AUX HEAT. Strip heat is far less efficient than your heat pump and will run up your energy bill the longer you use it.

How much more expensive is emergency heat?

When operating in the auxiliary/emergency heating mode, that cost goes up to around $1.30 per hour. If your heat pump is operating in auxiliary/emergency mode without due cause (outdoor temperatures are above freezing or no drastic adjustment to your thermostat), it is possible that your system is malfunctioning.

10 Things You Should Know About Emergency Heat

If you take a close look at your HVAC system, you may notice an emergency setting and wonder what it does. You may even wonder if you should give that setting a try but before you do, you need to know what it does and what it should be used for.

When should I use my Emergency Heat? HVAC FAQ's - Hannabery

The Emergency Heat switch on a Heat Pump thermostat confuses many people. The fact of the matter is that most people don't seem to understand exactly what Emergency Heat is and when they need to use it.

When to Switch Heat Pump to Emergency Heat - Arctic AC

When to Switch Heat Pump to Emergency Heat. If you use a heat pump in the winter, you know the equipment works like an air conditioner in reverse, extracting heat from outdoor air to warm your home. This heating method works incredibly efficiently until the outdoor temperature reaches about 35 degrees.

When To Use Emergency Heat On a Heat Pump - Air Conditioner Lab

Your heating pump will work well when the temperature is about 30 to 35 degrees, but below that point, it may struggle. In very cold conditions, your heat pump won’t be able to draw in warm air to meet the demands of your interior thermostat, and this is when you’ll need an alternative heat source for your home.. The emergency heating coil within the heat pump will kick on or can be ...

What to do before emergency heat?

Before you go for the emergency heat, make sure your furnace is still on and functioning normally. Check Your HVAC System for Damage Before Pushing the Emergency Setting: Before you activate your emergency heat, be sure to check your HVAC components for damage.

What is an emergency setting on an HVAC system?

The emergency setting is not for when you feel a little cold it is truly designed to protect you from extreme cold weather. Here are 10 things you need to know about the emergency setting on your HVAC system. Emergency Heat is Just What is Sounds Like: Under normal circumstances, your main heat pump should have no trouble keeping your home warm ...

What to do if you need to activate your heat?

If you need to activate your emergency heat, you also need to call your HVAC technician for repairs. Emergency heat is designed to get you over the hump and keep your home warm, but it is still important to have your primary heat pump checked and repaired. An Illuminated Emergency Heat Indicator Could Signal a Problem with Your Heat Pump: If ...

Why is the red light on my heat pump?

An Illuminated Emergency Heat Indicator Could Signal a Problem with Your Heat Pump: If the red indicator light is on but you did not activate emergency heat, there could be a problem with your heat pump. If the HVAC system detects an issue with the heat pump, it may illuminate the emergency light to let you know.

What happens if your heat pump stops working?

If your main heat pump stops working during a string of subzero days, your normally warm home could quickly become dangerous or even uninhabitable. In situations like this, the emergency heat setting on your heat pump thermostat could literally be a lifesaver. No matter what kind of heating system you use, the emergency setting on your thermostat ...

What does the red light on my HVAC system mean?

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. Make a habit of looking at your HVAC system and watching for ...

What happens to HVAC in winter?

All kinds of things can happen in the winter, from fallen trees crushing HVAC units to leaking water encasing them in a block of ice. Knowing what is going on will make your service call easier and allow you to get back to regular heat as quickly as possible.

How does a heat pump work?

When bitterly cold conditions don’t give it much to work with, the system automatically switches into Auxiliary Mode and kicks in a supplemental heat source. Depending on your home, this might be electric or gas, but it’s a backup mechanism that keeps the family warm until the heat pump can do its job again. The Emergency Heat setting bypasses this arrangement and fires up your supplemental heat with one switch. It’s important to note the word “emergency” in this equation, because turning it on shuts down the heat pump. It’s not a setting to turn on just because your feet are a little chilly.

Do you need to use emergency heat on a heat pump?

The good news is you’ll rarely need to use the Emergency Heat setting. Like it’s name implies, this mode is intended for worst-case scenarios. The bad news is that scenario means your heat pump isn’t working. However, it’s easy to jump to the wrong conclusions about your unit’s performance during the winter. You might assume that there’s a problem because it seems to run constantly. This is normal, and the heat pump’s design allows it to run efficiently for extended cycles. It also operates a defrost mode that heats the outdoor coil to melt off accumulated ice and restore optimal airflow. This produces a white, steamy smoke that lasts for about 10 minutes, but it’s not a sign of unit failure. You only need to switch on the Emergency Heat setting when the heat pump stops working.

What is an emergency heat pump?

The emergency heat pump, sometimes also called the “auxiliary heat” pump, is known in the HVAC world as the “second stage” of heat that your house runs on. In most HVAC units, the heat pump will pull in air from outside of your home or office that will then be heated or cooled to the desired temperature set by your thermostat. However, what happens when it is too cold outside for the air to be pulled in and heated normally? This is where emergency heat comes in.

Is it normal to use emergency heat?

One of the more common misconceptions about emergency heat is that it is normal to continually use it when it is especially cold outside. While it is true that the emergency heat setting will kick on when it drops to near or below freezing temperatures, as mentioned earlier, it is important to remember to turn your thermostat back to the regular heat setting when this occurs.

Can you run up your energy bill by overusing emergency heat?

So, say that you have now found yourself in a situation where it is necessary to turn on your emergency heat. Do not waste any more time and money running up your energy bill by overusing emergency heat or attempting to make repairs to your HVAC unit, air handler, or heat pump by yourself. Give City Heating and Air a call today.

Can emergency heat be used all day?

So, to sum up everything that we just covered, emergency heat is not supposed to run the way that your regular heat setting does—and it is especially not meant to run all day and night during the long, frosty winter months. This leads us to one more topic that we need to cover when it comes to using emergency heat correctly, and it can help keep your energy bill from breaking the bank.

Can you use emergency heat on top of regular heat?

Since emergency heat is essentially a second source of heating, you will wind up having to pay for using it on top of your pre-existing regular heat source. This can end up getting particularly costly, especially if you just keep running emergency heat simply because it is cold. Not only is this more expensive, but it is also harder on your HVAC unit—since emergency heat is only meant to run until the problem with your HVAC unit is resolved. This means that you could not only wind up having to pay a high energy bill, but you can also be paying for other costly repairs to your HVAC unit if you keep using emergency heat in this un – intended way. Therefore, it is imperative to know exactly what your emergency heat setting does as well as how to properly use it. Like any other appliance in your home or office: if you take care of it properly, it could last you a lifetime.

Why does my heating system use emergency heat?

When working properly, your heating system will utilize your Emergency Heat when the primary system is unable to handle controlling the temperature on its own or there is a problem with your heating system. If your fan doesn’t turn on either set your thermostat so the system doesn’t stay on.

Why turn on emergency heat?

Turning on emergency heat forces your system to bypass the heat pump altogether and work as though the main heat source is not working at all. This puts a great strain on the backup element that is only meant to be used in extreme circumstances for short periods of time.

What is the emergency heat setting on a thermostat?

Before you touch that Emergency Heat setting on your thermostat, read this! 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. Your heating system can then use the ...

Can you use an alternate source of heat?

Your heating system can then use the alternate source to supplement the heat, but if you force the system into the Emergency Heat mode then it becomes the sole source of energy, rather than its intended function.

Is it cheaper to run an emergency heat pump or an electric heat strip?

High energy bills. The cost of running your home on Emergency Heat would be astronomical. Turning to this setting switches the source of your heat from the heat pump to the electric heat strip, which is significantly less efficient and more costly.

What does emergency heat do?

What does the emergency heat setting do? Emergency heat is ideal for when the outside temperature is too cold for your heat pump to keep your home warm. If the heat pump freezes over or becomes damaged, you should switch to emergency heat and call an HVAC service provider.

When to use emergency heat setting?

The heat pump emergency heat setting is used when your heat pump needs a break to avoid system damage. Plus, it works well at warming your home in below-freezing temperatures.

What is emergency heat on your thermostat?

When the weather gets too cold, your heat pump isn’t able to pull enough warmth from the outdoor air to heat your home to the desired temperature. A secondary heating source, like emergency heat, can be used to keep you warm.

What to do if your heat pump freezes?

If the temperature outside climbs to 40 degrees or above and your home still won’t stay warm without using emergency heat, call your local HVAC service provider. Your heat pump may have frozen over or need repairs. We recommend getting your heat pump repaired as soon as possible before the winter weather returns and you’re stuck without proper heating.

What happens when emergency heat is turned on?

When emergency heat is turned on, your compressor and heat pump shut down entirely and your system’s radiation heat strips turn on. This brings in heat without damaging your outdoor heat pump system.

How does a heat pump work?

Heat pumps use electricity and refrigerant to create a comfortable home temperature. Refrigerant transfers heat from one place to another by flowing back and forth from an indoor unit (air handler) to a heat pump compressor (outdoor unit).

Why do we need heat pumps?

However, you should always have a backup heating source for when temperatures drop too low and emergency heat becomes a necessity.

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1.Emergency Heat: What You Need to Know in 2020

Url:https://www.hvac.com/heat-pumps/hvac-qa-what-is-my-heat-pumps-emergency-heating-setting/

29 hours ago  · The heat pump emergency heat setting is used when your heat pump needs a break to avoid system damage. Plus, it works well at warming your home in below-freezing …

2.10 Things You Should Know About Emergency Heat

Url:https://frederickair.com/home-comfort/10-things-you-should-know-about-emergency-heat/

36 hours ago  · Emergency heat is for emergencies. That means that your heat pump is not working at all. Sometimes it flips on automatically. If you notice your home is getting …

3.What Is Emergency Heat? - Max Air Conditioning & Heating

Url:https://www.maxair.com/what-is-emergency-heat/

3 hours ago Your heat pump will automatically begin heating your home as it gets colder, and if the backup electricity element is needed, it will start on its own. Turning your system to “Emergency Heat” …

4.The “Dos” and “Don’ts” of Emergency Heat - City Heating …

Url:https://cityheatandair.com/when-to-use-emergency-heat/

24 hours ago  · The emergency heat setting on a thermostat is typically used as a last resort when the heat pump is not working properly. The emergency heat setting will run the heating coils in …

5.Why You Should Never Use Emergency Heat (unless you …

Url:https://wentzelheatingandair.com/never-use-emergency-heat/

16 hours ago  · Depending on your home, this might be electric or gas, but it’s a backup mechanism that keeps the family warm until the heat pump can do its job again. The Emergency Heat …

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