There is nothing you can do to silence a window type air conditioner. Better option is to install split type air conditioner. In this the noise producing compressor and condenser fan are installed outside the room. Only a small blower fan is inside the room making this air conditioner. much silent.
Lack of Lubrication
If the fan motor of a window air conditioner is not properly lubricated, it can begin to emit a loud, continuous noise. You can open your window unit to lubricate the fan motor, but be aware that many of the motors are sealed within and are hard to reach.
Sound Blankets will not completely eliminate all of the noise from your air conditioner. They are designed as a cost-effective solution as compared to moving or replacing your air conditioner. In general terms you should expect the noise level to drop by 30% to 50%.
Ductless 'mini split' systems like Mitsubishi home air conditioning systems are the quietest air conditioners on the market today.
Utilizing anti-vibration mounts or pads under the cooler can further reduce noise by absorbing vibrations before they can spread through the floor or furniture. Maintenance plays a vital role in keeping your air cooler running quietly.
Common causes of air conditioner noise include loose parts, dirty filters, improperly mounted units, debris around the unit, and bent or damaged fins. You can fix most noises by tightening screws and bolts, cleaning or replacing filters, securing unit mounts, clearing debris, and straightening fins.
Normal Noises
If you put your ear up to where cool air exits the A/C, you'll hear the sound of blowing air coming from the fan within the unit. In that same area, you'll also hear a hiss or gurgle from refrigerant passing through the evaporator. Refrigerant is the special A/C liquid that helps to cool your space down.
Dust, dirt, and debris around the coil fins, air ducts, and outdoor condenser unit are common causes of noise. Loose or misaligned parts like the fan blades or belt, lack of lubricant, blockage in the drain pipe, copper lines, or vents, and a malfunctioning thermostat can also lead to a noisy air conditioner.
Most of the time, you can use weatherstripping to seal AC units and block all air leaks. Adhesive-backed weatherstripping is very easy to work with because it's a lot like using any strong tape.
You can reduce noise from an air conditioner by installing a sound blanket or sound curtain, choosing the location of the unit carefully, surrounding it with a fence, and adding sound absorbing or sound blocking material to the enclosure.
LG's Quiet Operation: LG window ACs operate at sound levels as low as 44 dB during sleep mode, thanks to their advanced BLDC motor and Dual Inverter Compressor. This quiet operation helps minimise disturbances, promoting a tranquil sleep environment.
Place Sound Barriers Around the AC Unit
A sound blanket can reduce noise by up to 40%. These blankets wrap around the compressor (typically the loudest component), where the rubber and glass insulation absorbs the noise, trapping it inside the blanket.
You can decrease the amount of noise that comes from your air conditioning unit by installing a sound blanket. It's also called a sound curtain. A sound blanket will absorb the sound of noise coming from your air conditioning equipment.
The ductwork could be undersized or not installed properly. But it could also be as simple as a blocked air filter. Maybe someone closed off too many vents. Yes this could cause the problem as well.
Installing acoustic vents can help to reduce the noise coming from trickle vents, making it easier for people to relax and enjoy their space. In addition, acoustic vents can also help to improve the overall acoustic quality of a room by absorbing excess sound waves.
An HVAC duct silencer is specifically engineered to reduce airborne noise carried along ducts or produced by enclosures. You'll also find these silencers described as sound attenuators when they are used in industrial settings.