Can I cover the top of my window AC unit?

Author: Abigale Shields Sr.  |  Last update: Friday, May 9, 2025

If you cover your AC, make sure you use a breathable fabric or just something to cover the top. You will have problems if you use a heavy plastic or cover the sides. There is likely already some form of moisture inside your AC unit. Humidity or early rain fall can cause moisture to build up in your AC.

Is it okay to cover the top of a window AC unit?

If you have a window unit, window air conditioner covers are usually not recommended either, because even the best cover won't keep the cold and moisture out. It's best to just take your window air conditioner out and put it in storage until summertime.

Is it okay to block a window air conditioner?

Blocking any vents will interfere with its operation. If you are out of the season where the AC is needed, make sure you disconnect the unit from power if you are going to block them.

Does putting a canopy over your AC unit help?

According to researcher Danny Parker from the Florida Solar Energy Center, who performed a two-year energy study, shading the unit provides “minuscule results at best” with efficiency being increased less than half a percent.

Can you build over the top of an AC unit?

Building your deck over top of an AC unit is entirely possible and quite common. The catch is you must leave enough space for the compressor to work efficiently and have easy access to the system for any maintenance or unit replacement purposes.

Air Conditioner Maintenance - Do I Need to Cover My Air Conditioner in the Winter?

What happens if you cover an AC unit?

The unit needs unrestricted airflow in order to function properly, and adding barriers can impede the airflow and reduce its efficiency. Additionally, placing anything on top of the unit can potentially cause damage or disrupt the balance of the unit, leading to costly repairs.

Can you cover the top of an outdoor AC unit?

A simple, breathable cover can be constructed using just plywood. Cut a sheet of plywood to fit the top of the AC unit only. Secure the plywood to the top of the unit for the cold winter months and remove it before summer comes and you need to run the air conditioning system again.

How do I protect my air conditioner from direct sunlight?

How to Shade Your Outdoor AC Unit
  1. Build a Simple Frame. ...
  2. Attach a Shade Cloth. ...
  3. Create an AC Unit Cover. ...
  4. Plant Trees. ...
  5. Install a Trellis. ...
  6. Design a Latticework Wall. ...
  7. Where You Install the AC Unit Matters. ...
  8. Paint Your AC Unit a Light Color.

Should I cover my AC unit in the summer?

Should I Cover My AC Unit During Summer? You should never cover your outdoor air conditioning unit during the summer when it's in peak use. While some think this will help protect the unit or lead to energy savings, it will do neither.

Why are window AC units bad?

A basic window unit typically has a lower initial cost than other models and is relatively easy to install, but they guzzle energy, straining electricity grids, and can contribute to the planet-warming emissions driving extreme heat. Here's how standard window air conditioners stack up against other cooling options.

Do window AC units pull air from outside?

Does it bring in fresh air? No, air conditioners do not bring in fresh air from the outside. That's not how they were designed. What actually happens is that your air conditioner uses a fan to draw air into the unit and disperse it through a structure.

Do window AC units need to be covered?

It is important to cover your window air conditioning unit, or remove it from the window, when winter rolls around. This is because while AC units are built to withstand the elements, they should be protected against things like snow and ice when they are not in use.

Is it bad to leave AC in the window all year?

Do I need to remove my window air conditioner in the winter? We recommend removing your window AC before the first frost of the year to protect it from the elements. We suggest you stop using your window AC for cooling once the outdoor temperature reaches 62℉. Most window ACs can't operate in temperatures below 62℉.

Is it okay to run window AC in rain?

Can I Turn On The AC If It's Raining? Rain alone will not harm your air conditioner. In fact, turning the system on during warm, rainy days can make your home feel much more comfortable. The only time you would need to be concerned is if the rain was severe enough to leave standing water around the unit.

Can a window AC be in direct sunlight?

Conclusion. Direct sunlight can have a profound impact on the performance and efficiency of your AC unit, leading to higher energy bills, accelerated wear and tear, and even potential breakdowns.

How do I protect my air conditioner from lightning?

Top 3 Ways to Protect Your Air Conditioner During a Storm
  1. Turn Off Your Air Conditioner. It is a good idea to turn off your unit during a lightning storm. ...
  2. Cover Your Unit. If there's a severe thunderstorm or hurricane coming, use a tarp to cover your unit. ...
  3. Inspect Your Unit.

Should I put an awning over my window AC unit?

Adding an awning over the window can increase efficiency. The awning blocks the sun's heat from entering the room and provides shade for the A/C unit itself. When installing it, make sure that it doesn't block the unit's intake and exhaust functions.

How to protect window AC?

Use screws or bolts to secure the brackets in place. This prevents thieves from pushing the air conditioner in or pulling it out. Screw in plastic vent flaps directly to the window frame. If the air conditioner is smaller than the window, plastic vent flaps need to be pulled tightly to cover up the holes.

Should you cover the top of your AC unit in the winter?

One of the benefits of covering your outdoor AC unit is that it can protect it from the elements. Snow, ice, and debris can accumulate on the unit, potentially causing damage and reducing efficiency. A cover can help prevent this buildup and keep your unit in better condition.

Can I cover the top of my AC unit?

Air conditioning systems are built to endure harsh weather conditions, moisture, and even some debris. Covering your AC unit with a tarp or other cover can cause other problems! For example, rodents seek shelter in covered areas like this during the colder months.

Can you cover the outside of a window air conditioner?

Yes, it's a good idea. The EPA recommends:"in the winter, be sure to insulate room air conditioners from the outside with a tight-fitting A/C unit cover." Frost King has a full selection of AC covers to keep both your window AC units and central AC units covered throughout winter.

Is it a good idea to cover your outside AC unit?

If you're considering covering your outside AC unit in the summer, whether to protect it from bad weather or to possibly save energy, the reality is that you should never cover your AC unit – not even during bad weather. For one thing, outdoor AC units are specifically designed to live outdoors.

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