Tips The Will Assist With A Noisy Window A/C Unit

If your window air conditioning unit is making a rattling noise when it is turned on, it may not be properly insulated or the condenser coil or fan may be dirty. The following tips will help you resolve the problem. 

Use The Following Items

  • self-adhesive weatherstripping
  • measuring tape
  • scissors
  • spray foam insulation
  • wire brush
  • coil cleaner
  • lint-free cloths
  • fin tool 
  • wet/dry vacuum cleaner
  • oil

Realign The Unit And Insulate It

If any gaps are surrounding your unit, it will cause it to vibrate and sound louder than normal. Check the unit to make sure that it is set in the window the proper way. If it appears to be crooked, have a friend assist you while you lift up the window and line it up evenly. If side panels surround your unit, inspect them to make sure that they are not cracked or loose in the window.

Cut strips of self-adhesive weather stripping to fill in any small gaps next to or above your unit. Peel off the backing and press the weatherstripping against the sides and top of your unit. Spray foam insulation is another product that will effectively fill gaps. Spray the insulation evenly around the unit. It will expand after it is applied, filling in the open areas.

Clean The Condenser Coil

Turn the power off to your unit and remove the front cover. Visually inspect the condenser coil and fan to determine if either one needs to be cleaned. The condenser coil consists of metal pieces that run across the front of the unit. Use a wire brush to remove debris that is stuck between the pieces.

Spray coil cleaner on the condenser coil's surface to remove stains. After the cleaner has been applied it will foam up. Allow it to penetrate for several minutes and wipe away the excess with a lint free cloth. If any of the condenser coil's metal pieces are bent, straighten them with a fin tool. Wedge the tool underneath the area that is misshapen and press against the metal until it is even with the adjacent pieces.

Clean And Oil The Fan

The fan sits below the condenser. Slide it forward, being careful not to disconnect the wires. Wipe the blades off with a damp cloth. Use the hose on a wet/dry vacuum cleaner to suck up any debris that surrounds the fan. Add a few drops of oil to the fan motor's bearings. These pieces are located on the outer case that surrounds the motor. Slide the fan back into place. Reattach the front cover to your unit.

Turn the power on to your unit and adjust the thermostat. If your air conditioning unit no longer sounds loud, the problem has been resolved. Inspect the insulation and clean the condenser coil and fan a couple times each year to prevent your unit from sounding loud in the future. For further assistance, contact professionals, such as those from Cleveland Plumbing & Heating Inc.


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