Knowledge Builders

should my outside unit run when heat is on

by Retta Collier Published 2 years ago Updated 2 years ago
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With your heat pump ready, you may be wondering if the outside unit fan should run when the heat is on. The answer to that is yes, it should run even when the heat pump is on. The fan helps to draw the outside heat in, helping the heat pump perform efficiently.

Heat Pump Operation
The air conditioning coils may sit atop of the furnace, and they likely share a blower fan, but otherwise the units operate independently of one another. Therefore, when you run the furnace in the winter, the outside unit should not run as it only functions as part of your air conditioning system.
Mar 11, 2015

Full Answer

Should the outside fan run when the AC is on?

Yes, the outside fan should run when the AC is on. Air conditioners operate by absorbing the heat inside your home and releasing it outdoors. Similar to heat pumps, the outside unit fan assists in dispersing heat of the hot coils into the environment and cooling the coils down.

Can you run a heat pump outside in the winter?

With an air-source heat pump, the answer is no. The reason the outdoor unit of your heat pump is on during the winter is this: it is absorbing the heat in the surrounding air for your home. It may seem incredulous that cold air can have heat, but it does.

Why won’t my heat pump work outside?

If you don’t see your heat pump’s outdoor unit working for a long period of time, there may be a problem with the system. One of the more common problems with any heat pump system is the development of refrigerant leaks.

When should an outdoor fan run on a split heat pump?

You might be wondering when outdoor fans should run on split heat pumps. Your split heat pump’s fan runs when it’s moving air and turns off when the system is powered off or not moving air. The fan should run if the split heat pump attempts to cool or heat your home.

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Why does my outside AC unit run when the heat is on?

Your thermostat is set for “heat”, warm air is coming from your vents, and everything in your heating system seems to be working perfectly – except for the fact that your outdoor air conditioner unit is running. Why? The answer is simple: your outdoor unit is a heat pump.

Does outside unit run when central heat is on?

A heat pump is an all-in-one heating and air conditioning system. And most of the same components that are used for air conditioning are also used for heating. That means that you can expect to hear the outside unit running when the heat is on.

Should the fan be on when the heat is on?

Your HVAC fan should turn on and off with the rest of your heating and cooling system. It's normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops, but your fan shouldn't run for hours on its own.

Should my outside unit run in the winter?

The fans in the outdoor unit must also run in order to draw the outside air across the coils where the refrigerant absorbs its heat through evaporation and then takes it indoors.

Should heat pump fan run when heat is on?

The fan on your unit should spin when you want air in your house and shouldn't spin when the temperature of your house matches the thermostat setting. Heat pumps take in hot air from the outside and cool it before blowing it into your home.

Should the thermostat be on AUTO or on for heat?

If you want to keep the energy bills low, you should set the thermostat to 'Auto'. However, if you prefer more even distribution of heat inside the house, it's better that you set the thermostat setting to 'On'.

Why is the fan not turning on my heat pump?

Outdoor debris can get into the system and clog it. It is important to have a clear area around your heat pump year-round. If you see something that is lodged in your heat pump fan, turn off the power and then see if you can dislodge it with a tool or a stick.

Should I run my furnace fan all the time in the winter?

Furnace fans are designed to run all the time, so there's no need to worry about it failing prematurely. Much of a furnace fan's wear and tear comes from the starts and stops of the motor; keeping it running can eliminate this type of stress.

Does heat and AC come from the same unit?

Understanding that your AC and furnace work both separately & together can be slightly confusing. Simply put, the air conditioning part of your heating, ventilation, air conditioning (HVAC) system chills refrigerant (with an outside unit) while the furnace works inside with fans and coils.

Why is my outside AC unit not running?

Check the circuit breaker and see if there is a blown fuse. There could have been a blown fuse to the circuit breaker that caused the outside AC unit to stop working correctly. A blown fuse is caused by an overloaded circuit breaker, which can happen if the AC unit is overworked or the wires are loose and aging.

Why is my outside heat pump not working?

One of the most common problems is blown fuses or flipped circuit breakers. If your unit is not working, make sure to check your fuses and circuit breakers. It could be as easy as a flip of a switch.

How do I know if my heat pump is working properly?

The main way to tell if your system is working as intended is to simply listen to the unit running. You can hear the system when it turns on, when the fans begin to work and stop, and when air passes through the ducts. Other than that, the unit itself should be quiet, without any groaning or creaking sounds.

How does a heat pump work?

With a heat pump, the process reverses in the cooler months. Refrigerant absorbs heat from the outside air and moves it indoors with the help of a reversing valve and multiple check valves. This is highly efficient because it takes less energy to move heat than generate it.

How does refrigerant work in an AC unit?

Just as with a normal AC unit, refrigerant absorbs heat from one area to another. Heat is absorbed at the inside evaporator coil in the summer, and then it’s released outdoors at the condenser coil. With a heat pump, the process reverses in the cooler months. Refrigerant absorbs heat from the outside air and moves it indoors with the help ...

Do you run a split system in the winter?

The air conditioning coils may sit atop of the furnace, and they likely share a blower fan, but otherwise the units operate independently of one another. Therefore, when you run the furnace in the winter, the outside unit should not run as it only functions as part of your air conditioning system.

Can you run a furnace in the winter?

Therefore, when you run the furnace in the winter, the outside unit should not run as it only functions as part of your air conditioning system. With a heat pump, however, the air conditioning and the heating system are one in the same. Just as with a normal AC unit, refrigerant absorbs heat from one area to another.

How does an interior heater work?

The interior system works with a few steps designed into it. As you activate the heater, a pilot light or electrical-heating element turns on. You might hear humming noises as the system heats up. When the proper temperature is reached, the heater's blower activates and forces warm air into the rooms.

Why do Florida homes have heat pumps?

Many Florida homes are turning to heat-pump installations because of their efficient heating and cooling operations. The outside unit may be a heat pump that's supposed to work during both cooling and heating periods. When you activate a heat pump, it draws on any warmth found outside and forces it into the system.

Why is a fan connected to a condenser?

A large fan connected to the condenser allows heat to be moved from the refrigerant as the AC system tries to cool the home during the summer. The heating system is largely isolated to the interior.

Why is my split AC activation wrong?

The activation may simply be a mistake because of the wrong mode being accessed. Take a look at the control panel connected to the split system. In many cases, the switch that activates the heating or cooling has a dual purpose. It could be in the wrong mode, which forces the AC to work instead of the furnace.

What should be kept away from the interior and exterior components?

Professionals suggest that any items should be kept away from the interior and exterior components, such as stacked boxes or chairs. By learning the facts about your type of system, you'll know what is considered normal or unusual.

Does an outside air conditioner always work?

In contrast, the air-conditioning mode will operate in the exact opposite direction. In the end, the outside unit will always work when the system is powered on.

How Does a Heat Pump Heat?

The key to a heat pump offering both heating and cooling is a component called a reversing valve. This valve changes the flow of the refrigerant in the system, which is how the heat pump can offer two modes of operation. As the homeowner, the switch from heating to cooling is very easy: simply push a button on your dual-mode thermostat – the heat pump does the rest.

Why is my heat pump on in the winter?

The reason the outdoor unit of your heat pump is on during the winter is this: it is absorbing the heat in the surrounding air for your home. It may seem incredulous that cold air can have heat, but it does. Your heat pump, with the help of the refrigerant in the system, absorbs this heat and then concentrates it. Once the heat is concentrated, it is distributed to your home’s living spaces. During the summer, the opposite happens: your heat pump, with the help of the refrigerant, absorbs the heat inside your home and transfers it outside. Heat pumps don’t generate heat; they simply transfer it from one location to another, using refrigerant to facilitate the transfer. This is why you’ll see your heat pump’s outdoor unit operate during the winter months.

Does a heat pump in Wethersfield work in the winter?

If you see the outdoor unit of your heat pump in Wethersfield work during the winter, don’t worry – that’s what it should be doing. But should you run into problems with your heat pump this winter, call Dynamic Mechanical Heating & Air Conditioning to schedule a service appointment for professional heat pump repair service.

When Does the Outside Fan Run on a Split Heat Pump?

When your fan should be running, the two primary situations are if the unit is on or actively trying to defrost itself in colder temperatures for use in frigid temperatures.

Why is the Fan On a Split Heat Pump Not Running?

There are many reasons why the fan on a split heat pump might not run, but below are three of the most likely scenarios.

Should the Fan Turn On When the Heat is On?

It most certainly should be. If you switch on your heat pump, the fan should turn as the two operate alongside each other.

How to reduce heat in house?

Anything you can do to reduce heat in your house (other than continually lowering the thermostat) will help your AC unit run more efficiently in high temperatures. Heat reduction measures may include not running your clothes dryer during the day, keeping your blinds or window shades closed, and not using your oven.

How hot should the thermostat be for an air conditioner?

The majority of air conditioning units are designed to only cool the air about 20 degrees from the outside temperature. If the temperatures outside are approaching triple digits, you should set your thermostat at about 78°.

Why is it important to keep your air conditioner running longer?

Because it pumps more air volume it cools the house much faster . You might think this was a good thing but instead it means the system is running through off and on cycles at a much higher rate. The shorter cooling cycles means it is not quite running long enough to be pulling humidity out of your home. Removing humidity is part of how an air conditioner works. The condensing coil condenses water out of the air and the heat exchange process during that activity is what creates the cooler air. Warmer air and moisture is then exited from your home. Dryer air, even when warmer, is more comfortable for the human body as it allows our internal air conditioning, evaporation of sweat, to be more efficient. Not removing sufficient humidity from your home could also lead to mold problems.

What to do if you haven't had your AC serviced?

If you've not had your system serviced yet this year, call your ac contractor (in Houston and area, that's us) and get it done. But you might need to wait a while, we get very very busy in times like this (does everyone wait till the last minute? Seems they do).

Is it hot in Houston?

Here in Houston we just set a record for a straight 15 days in a row with daytime temperatures reaching or exceeding 100 degrees Fahrenheit. Yes it's hot, and air conditioners are taxed to their performance limits to try to keep up with cool air demands. Here's some things you need to know about running your AC unit in these kinds of conditions.

Does AC need to be running for each cooling cycle?

Anything you can do to keep the house cooler, even a little bit, means the AC does not need to be running as long for each cooling cycle.

Does regular maintenance help with hot weather?

In addition, regular maintenance will help your system perform at its peak when hot weather hits. Schedule a maintenance visit by contacting us today!

Why does my heat pump keep running?

Here are several things that may be the cause of the problem: Undersized System — If your heat pump hasn’t been properly sized for your home, then you can expect it to constantly run to keep your household cool. One common reason for this to occur is because of a new addition to your home.

Why does my heat pump run in the summer?

Heat Pump Issues During Summer. If the temperature outside is above 100°, you can most likely expect your heat pump to run constantly in order to keep your home cool. If it continues to run all the time even when the temperature outside drops, however, then you may be in need of heat pump maintenance. Here are several things that may be the cause ...

Why is it important to have a heat pump in the summer?

In fact, proper heat pump settings for summer are always important because it can mean the difference between a comfortable household and one that’s almost unbearable. Since Florida summers are so hot, we often expect our heat pumps to run for a long time. The question is, should they run constantly?

How does a heat pump work?

Heat pumps work by transferring heat, as needed. If you’re trying to cool down your home, it will transfer the heat outside.

What temperature should a heat pump be set at?

A general rule of thumb is that you should set it at around 78° when you’re at home and as high as 88° when you’re away.

What happens if your outdoor unit is blocked?

Blocked Outdoor Unit — If your outdoor unit has become blocked by debris, this can clog up the system and prevent proper cooling. In most instances, washing everything off with a hose will do the trick.

How long does an HVAC system last?

If you add a room, be sure that the heat pump is still big enough. Aging System — HVAC equipment is built to last for many years, but will eventually wear out. If your system is more than 10 years old and is running constantly, it may be time for a replacement.

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1.Should The Outside Fan Run When The Heat is On?

Url:https://www.houseunleashed.com/should-the-outside-fan-run-when-the-heat-is-on/

26 hours ago  · Should the outside fan run? The outside fan should be running when the heat pump is on. The fans on both ends help steer heat in either direction based on the operation of the heat pump. While operating heat pumps in cooling mode, the outside unit fan must run and facilitate the necessary heat exchange. It draws air across the coils which leads to more heat being …

2.outside unit running when heat is on - DoItYourself.com

Url:https://www.doityourself.com/forum/gas-oil-home-heating-furnaces/45959-outside-unit-running-when-heat.html

13 hours ago Does the outside fan run when heat is on? The fans in the outdoor unit must also run in order to draw the outside air across the coils where the refrigerant absorbs its heat through evaporation and then takes it indoors. Nonetheless, you should stay vigilant when it comes to the sounds your heat pump makes while it operates.

3.Why Does the Outside Unit of My Heat Pump Run in …

Url:https://www.bartelsheatingandcooling.com/blog/why-does-the-outside-unit-of-my-heat-pump-run-in-heating-mode/

31 hours ago Turn on the heat and check the outside unit Once you feel hot air coming through your vents, walk outside and see if the outdoor unit is running. You see, a heat pump is an air conditioner that can also provide heat during the winter. So if the outside unit is running and producing heat, then you have a heat pump.

4.My Heater is Running: Why Does the Outside AC Unit Run …

Url:https://www.midpointac.net/single-post/2017/02/08/My-Heater-is-Running-Why-Does-the-Outside-AC-Unit-Run-Too

15 hours ago  · The outside unit should only be part of the air conditioning unit outside should not be running in the heating cycle, only if set to cool not heat. If both the air conditional and the heat is running at the same time, it would be quite a inefissant(sp) system. I have never heard of a system that would require an outside unit to run while heating.

5.Should My Heat Pump's Outdoor Unit Be Running in Winter?

Url:https://www.dynamichvac.net/blog/should-my-heat-pumps-outdoor-unit-be-running-in-winter/

26 hours ago  · Therefore, when you run the furnace in the winter, the outside unit should not run as it only functions as part of your air conditioning system. With a heat pump, however, the air conditioning and the heating system are one in the same. Just as with a normal AC unit, refrigerant absorbs heat from one area to another. Heat is absorbed at the inside evaporator …

6.When Should Outside Fans Run on Split Heat Pumps

Url:https://homeinspectioninsider.com/outside-fans-run-split-heat-pumps/

4 hours ago  · When you have a standard furnace, the outside AC unit shouldn't run at all. The interior system works with a few steps designed into it. As you activate the heater, a pilot light or electrical-heating element turns on. You might hear humming noises as the system heats up.

7.Running your Air Conditioner when its 100+ Degrees …

Url:https://www.cleartheairac.com/running-your-ac-when-its-100-degrees-outside/

23 hours ago The reason the outdoor unit of your heat pump is on during the winter is this: it is absorbing the heat in the surrounding air for your home. It may seem incredulous that cold air can have heat, but it does. Your heat pump, with the help of the refrigerant in the system, absorbs this heat and then concentrates it.

8.Heat Pump Settings for Summer: Should a Heat Pump …

Url:https://www.achvservices.com/heat-pump-settings-for-summer/

27 hours ago  · Your fan should be running without question if your heat pump is on. The fan working is primarily due to the outside and inside units working in tandem with one another. Knowing this, yes, they should both be working in unison, and if they aren’t, you have some issue with your system and should have it looked at.

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