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The Daily Insight

How do I prepare my window air conditioner for winter

Author

Charlotte Adams

Published May 09, 2026

We recommend you remove any air conditioner from a window location. During the winter months, heat could escape through the accordion extension panels on the A/C and the chassis; cold air could also infiltrate your home the same way. To avoid injury, move the unit with another person.

Can I leave my window air conditioner in over the winter?

We recommend you remove any air conditioner from a window location. During the winter months, heat could escape through the accordion extension panels on the A/C and the chassis; cold air could also infiltrate your home the same way. To avoid injury, move the unit with another person.

What do you do with a window air conditioner in the winter?

Keeping the unit contained will help preserve its physical appearance. Before placing it in the box, wrap a plastic bag or garbage bag around the unit to further protect it. The unit should be stored indoors, and ideally in an attic or basement. Don’t store a unit outside, as that further subjects it to the elements.

Should you winterize a window AC unit?

While your window air conditioner works in the summer to keep your home cool, do not allow it to continue to cool your home during the winter months. Seal drafts and keep your home warmer when you winterize window air conditioners before the cold weather begins.

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 you cover the air conditioner 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.

How can I make my window air conditioner more efficient?

  1. Wash your windows. …
  2. Level it off. …
  3. Go clear. …
  4. Fill the gaps. …
  5. Clean the filters. …
  6. Clean the coils. …
  7. Help keep it cool.

What should I set my thermostat to in the winter at night?

  1. When Home: 68-70 degrees Fahrenheit.
  2. When Sleeping: 65 degrees Fahrenheit.
  3. When You’re Away: 65 degrees Fahrenheit.
  4. Adjust thermostat in 5-8 degree increments.

Do you turn the air conditioner up or down to make it cooler?

When you arrive, the house feels hot and stuffy, so you crank down the air conditioner to speed up the cooling process. In reality, turning down the air conditioner to a lower temperature won’t result in faster cooling.

Is it better to keep doors open or closed for window air conditioning?

It is highly recommended that you close all windows and doors when the air conditioner is turned on. This will keep the cool air inside the room and keep the temperature moderate. … This is because the open windows let warm air inside. This extra stress may cause the air conditioner to become faulty prematurely.

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Can you add Freon to a window air conditioner?

Do keep in mind that while you can add Freon to a window AC yourself, EPA requires that everybody you hire to do it for you, has to have proper HVAC certification to recharge the unit. If you don’t really know which HVAC technicians have certification, you can simply use this HVAC technician form here.

Why is my window AC not cooling my room?

The most common cause of window air conditioners not blowing cold air is a lack of adequate air flow. … If the air filter is dirty or clogged, there may be little or no air flow over the evaporator coils, which may cause them to become too cold and frost or ice can form on them, restricting the air flow even more.

How do you seal an outside window air conditioner?

To get the perfect seal on the outside of the unit, use exterior caulk all around the perimeter. An alternative to weather stripping is spray foam insulation. The kind you get in a tube from Lowe’s or Home Depot. If you never plan to remove your window air conditioner, it’s fine to apply directly.

How many years does a window air conditioner last?

A. Units should last eight to 10 years, but troubleshoot yours before replacing it. (If you really do need to get rid of it, make sure you follow our tips on how to get rid of practically anything.) First, inspect the seal around the unit to make sure no warm outside air is leaking in.

Does shading your 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.

What is the coldest setting on AC?

Air conditioners are not designed to operate in or produce temperatures below 60 degrees. Truth be told, they’re happiest around the 68 degree mark. Most thermostats simply won’t allow you to choose a setting below this mark.

How do I make my air conditioner warmer?

First, make sure the fans are running counter-clockwise. You want them to blow the air straight down. If you set them clockwise in the winter to help keep things warm, turn them back now. Secondly, turn off the fans if you’re not in going to be in that room for a while.

How do I lower the temperature on my air conditioner?

  1. Turn off at night, and save while you sleep. This money-saving tip is as clear as night and day! …
  2. Thermostats and timers – set and save. …
  3. Get shady and shut out the sun. …
  4. Turn off those heat-emitting culprits. …
  5. Keeping it clean to keep costs down.

What is a good winter thermostat setting?

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.

Does it make sense to turn down the thermostat at night?

Says the U.S. Department of Energy on energy.gov, “You can easily save energy in the winter by setting the thermostat to 68 degrees while you’re awake and setting it lower while you’re asleep or away from home.” Figure you save up to 1 percent per year on your heating bill for each degree you set back the thermostat …