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InsightHorizon Digest

Should you cover your central air unit in the winter

Author

James Bradley

Updated on April 02, 2026

Outdoor cooling units are built to endure these harsh winter weather conditions, which eliminates the need for a cover. Moisture (water) can freeze the air conditioner’s condenser coils, which can cause damage over time. However, there is no way to keep moisture out 100% of the time.

Do I need to cover my central air unit in the winter?

Outdoor cooling units are built to endure these harsh winter weather conditions, which eliminates the need for a cover. Moisture (water) can freeze the air conditioner’s condenser coils, which can cause damage over time. However, there is no way to keep moisture out 100% of the time.

Does covering your AC unit help?

Covering your air conditioner will block proper air flow which can lead to mold growth on your evaporator coils. The mold can block proper airflow through your coils and decrease your air conditioner’s efficiency.

How do I protect my central air unit in the winter?

Put plywood over the top of the unit only to shield from snow and ice, weighing it down with bricks or rocks to keep in place. Install a wood awning or shelter attached to the building that covers the top of the unit. Plant shrubs around the unit to protect from wind and blowing snow.

What temperature should AC be set at in winter?

Set your thermostat to 68 degrees Fahrenheit in the winter According to ENERGY STAR, setting your thermostat to 68 degrees Fahrenheit (20 degrees Celsius) when you’re home is the ideal balance of comfort and energy efficiency.

Should I turn off my air conditioner in the winter?

On unusually warm winter days, the AC unit might intuitively switch back on, and the water it creates in the cooling process will only freeze when temperatures get low enough again. It’s best to manually switch the unit off than to trust that it will stay inactive during the winter.

What happens if you run AC with cover on?

Running an air conditioner with its cover on doesn’t allow for this exchange of heat and condensation. It will put undo stress on the unit, which can damage internal components that keep the air conditioner running. Leaving the cover on can cause the unit to overheat since the heat has nowhere to go.

Can I put a roof over my air conditioner?

The simple answer is anything you would put over the top of that condenser/compressor unit to lower the noise level and placed so as to not restrict airflow would be at such a height that it would be useless for the purposes intended.

Should I turn off my AC unit in winter?

Yes. There should be a disconnect in your panel box or at the outside unit. By turning it off over the winter, you will save energy. However, when you turn it on again in the spring or summer, do it at least 24 hours before turning on the cooling unit.

Does shading your outside AC unit help?

Energy.gov confidently states that “shading the outside unit can increase its efficiency by up to 10%.” Even house-savvy BobVila.com proclaims, “Shading your air conditioner can reduce energy costs by as much as 50 percent.” … AC condensers have a harder time blowing heat from their coolant when it’s hot outside.

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Can I use AC in winter?

When running an air conditioner in the winter, the unit reverses its function and fills your space up with warm air instead of cold—saving you the cost of getting a separate heating system. So yes, air conditioners do indeed work in winter.

How do you cover an outside AC unit?

  1. Build a Wooden Cover. …
  2. Get Creative With an AC House. …
  3. Hide It Behind the Bushes. …
  4. Make a Box With a Door. …
  5. Stack Planter Boxes in Front of the Unit. …
  6. Place the Outdoor Unit Inside Aluminum Slats. …
  7. Grow Vines Around Outdoor AC Unit. …
  8. Create a Shed.

Is 72 too high for thermostat in winter?

68 to 72 degrees is a temperature range that is not too warm or cool, and is sufficient enough to warm up the home just enough so that everyone is comfortable regardless of the type of clothing they have on.

What should you keep your thermostat on in the winter?

For winter, the ideal thermostat temperature is 68 degrees Fahrenheit when you’re at home. Energy.gov 68 degrees is a good room temperature while you’re awake at home, but recommends lowering it while you’re asleep or away. Lowering your thermostat 10-15 degrees for eight hours can reduce your heating bill by 5-15%.

Is 70 too high for thermostat in winter?

It’s best to not set your thermostat lower than 70 to 72 degrees. Most units are not designed to cool a house below that point, and you risk the system freezing up.

Are air conditioner covers safe?

A Cover Could Do More Harm Than Good Because moisture is all but guaranteed to seep into your air conditioner anyway, a cover can actually cause damage. Moisture inside the unit could become trapped, leading to mold.

How do you ruin an air conditioner?

  1. Low refrigerant. Your air conditioner uses the refrigerant to expel the heat and moisture from the indoor air. …
  2. Frozen evaporator coils. …
  3. Dirty condenser coils. …
  4. Fan problems. …
  5. Leaking duct. …
  6. Thermostat problems. …
  7. Clogged drains. …
  8. Replace dirty filters periodically:

Do I need to cover my AC unit when it rains?

In most cases, the condenser unit should never be covered. Rain cannot harm the condenser, as long as the moisture can evaporate freely, and neither can the cooler weather of a Florida winter. … Otherwise, simply keep the condenser free of debris, and rinse the dirt out periodically.

What do you do with central air in the winter?

  1. Do: Shut off the power to the unit. …
  2. Do: Remove any debris stuck in the unit. …
  3. Do: Cover the unit with a sheet of plywood. …
  4. Do: Wax the outside of the unit. …
  5. Don’t: Wrap the condenser in plastic. …
  6. Do: Remove snow and ice through the winter.

Is it bad to turn AC on and off frequently?

Turning your air conditioner in and off forces it to run at lower speeds for shorter periods, which ends up worse for you because now you have both a hot house and a high energy bill. It also adds extra strain on your unit, which can age it prematurely, resulting in you needing an emergency AC replacement.

Is it cheaper to leave air conditioner on all day?

In general, it is cheaper to leave the AC on all day during very hot temperatures. … After even just a couple of hours, your AC will have to work hard to lower the temperature back to a comfortable level. This can take a long time and place too much strain on the system.

Should you turn your HVAC off?

Turning off your air conditioner during the day will certainly conserve energy, but problems arise when you get back home and turn your system back on. If you leave your air conditioner off during the day, indoor temperatures will continually rise while you’re gone.

When should I turn my AC off in the fall?

Watch the Weather Don’t turn your A/C unit fully off for the fall until you know that it is the right time. A good way to gauge this is to keep an eye on upcoming weather. Once temperatures are consistently below 75 degrees, you should be safe to shut down your cooling system until next year.

Do you need to cover heat pump in winter?

No, do not cover your heat pump in winter! To function properly, a heat pump needs to pull in the outdoor air through the side vents and exhaust through the top of the unit. If you cover your heat pump, it may not operate as designed and may cause damage to the system.

How do I keep my heat pump from freezing?

Heat pumps are designed to pull cold air from a home and not freeze up. To prevent this from happening, the heat pump must go into defrost mode when it becomes too cold. Defrost mode tends to switch the heat pump into air conditioning mode for a while till it unfreezes. After which, you can go back to heat mode.

Is it OK to spray water on your air conditioner?

The good news is that you absolutely can spray water on your air conditioner if it needs a cleaning, and nothing bad will happen. Spraying water on your AC’s condenser also helps it run more efficiently. In fact, your condenser needs a regular spritzing in order to keep doing a good job.

Is it OK to spray water on your air conditioner while running?

Does spraying water on my air conditioner help it run more efficiently? … Spraying water on your air conditioner can help it run more efficiently if you remove enough dust, dirt and debris to help improve airflow and prevent it from overheating. It’s certainly not going to damage your AC unit to do so.

How can I shade my central air unit?

Shading the entire side of your house and the outdoor air-conditioner unit is most effective. This can be done with trees or an awning. Particularly with a brick, masonry or stucco house, the house wall acts like a huge solar collector and actually raises the temperature of the air around the air conditioner.

How cool should my house be if it's 90 outside?

They recommend that when it’s 90 degrees outside, you should try setting your air conditioning thermostat at 80 degrees or higher. And when it’s 95 to 100 degrees outside (and higher), you should set your thermostat at 85 degrees or higher.

What temperature should my AC be on?

According to the Department of Energy1, 78° Fahrenheit is the sweet spot for air conditioners to balance energy savings and comfort when people are at home and need cooling.

Can you box in an air conditioning unit?

Allow Sufficient Airflow The most popular way we’ve seen homeowners hide their air conditioner condenser is to enclose the unit behind a fence, screen or latticework. … Never box in your unit with a solid structure—you must allow ventilation through large lattices or screens!