
If your window AC unit is making strange noises, it's likely due to worn-out parts or improper installation. Check the unit's air filter, which should be cleaned or replaced every 1-3 months, as a dirty filter can cause the unit to vibrate and produce noise.
The most common issue with window AC units is a frozen evaporator coil, which can be caused by low refrigerant levels, a clogged air filter, or high humidity. This can be fixed by turning off the unit, allowing it to thaw, and then cleaning the coil with a soft brush.
A faulty thermostat can also cause strange noises, as it can lead to the compressor running continuously. In this case, try replacing the thermostat or having it adjusted by a professional.
By following these simple steps, you can troubleshoot and potentially repair common issues with your window AC unit, saving you money and reducing waste.
Troubleshooting
Troubleshooting your window AC unit can be a daunting task, but it's often a matter of identifying the root cause of the issue. A dirty air filter is the most common reason a window AC is not cooling, so make sure to clean or replace them often.
You can easily check if your air conditioner's thermostat is working by using a multimeter's continuity tester and an ice cube. If the thermostat is faulty, you may need to replace it.
Here are some common issues and their possible causes:
- Window AC not blowing cold air: Dirty filters & coils, faulty thermostat, or compressor failure.
- Window AC has power but is not turning on: Check if the circuit breaker has tripped or if there's an issue with the electrical connection.
- Window AC is running non-stop: Malfunctioning thermometer or faulty compressor.
Remember to always turn off your window AC before investigating any issue, and consider consulting a professional if you're unsure about how to proceed.
Fixing 10 Common Issues
A dirty air filter is the most common reason a window AC is not cooling, so make sure to clean or replace them often.
If your window air conditioner fails to turn on, verify whether it's receiving power by unplugging it and plugging it into a different outlet.
The compressor is a pivotal component in any air conditioning system, and if it's not functioning properly, it hinders the flow of cold air, resulting in inefficient operation of the air conditioner.
To address issues like refrigerant leakage, low refrigerant levels, or faulty wiring, it's advisable to seek assistance from your local window AC repair technician.
A constantly running window AC indicates a malfunctioning thermometer, which can be replaced yourself, but ensure to use a new thermometer approved by the manufacturer for your specific window air conditioner model.
If you notice ice forming on your air conditioner, it's a sign of a problem that requires immediate attention, and the most common reasons include dirty filters and coils, refrigerant leakage, compressor failure, and inadequate HVAC airflow.
Low refrigerant levels in your air conditioning system are typically caused by refrigerant leakage, which can be fixed by a window AC repair technician before recharging the system with refrigerant.
Exhaust fume smell from your AC unit can signal a refrigerant leak, releasing chemicals into the air, so turn off the unit immediately and ventilate the space.
Here are the 10 common issues you may encounter with your window air conditioner, along with possible causes and solutions:
Making Strange Noises
Loud AC noises like banging, buzzing, or rattling indicate potential issues that require attention.
Banging or screeching noises often indicate problems with various fan components.
Simple fixes like lubricating the fan motor or straightening a bent fan blade may resolve the issue.
However, more severe damage will require professional assistance to replace the fan belt.
Sudden rattling sounds indicate that a foreign object has likely fallen into your window AC.
Leaves and debris commonly find their way into the slats on the exterior, causing disturbances as they hit the fan inside.
Trim the leaves and vegetation around the outdoor unit to prevent this issue.
Improper installation of the unit in the window can also cause your AC to make noises.
It may vibrate against the window sill or frame.
A rattling sound could indicate that the fan blades need to be re-attached or balanced.
A squealing noise may signal a belt issue.
A grinding noise often means a problem with the compressor.
If you can't track down the source of noises coming from your air conditioning unit, call for repairs.
Bad bearings may be the cause of the noise, best handled by an appliance repair person.
Basic lubrication may solve the issue, but it's best to see a video for more information on how to oil or replace the bearings.
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Water Leaking
If you notice your AC leaking water, inspect the drain pan to ensure it's properly tilted for effective drainage.
The drain pan is designed to collect moisture from the evaporator coils, and it's angled downward to facilitate drainage. A misalignment between the drain pan and the drain port can cause water to leak inside.
Check if your AC unit is level in the window, as this can also cause water leakage. To address this, start by unplugging the AC unit and adjust its position to ensure it's properly leveled.
Dirt and debris can build up inside the window AC drain hole, causing water to leak instead of draining properly.
Consider reading: My Clothes Washer Won't Drain
Common Issues
If your window AC isn't blowing cold air, it's likely due to a dirty air filter or refrigerant leakage.
A dirty air filter is the most common reason a window AC is not cooling. Clean or replace the filters often to remove the dust and dirt blocking the passage of cool air.
If your window AC has power but is not turning on, it might be due to a tripped circuit breaker or a faulty electrical connection.
Your window unit can also turn on and off too quickly if the thermostat is set too low or the AC is overloaded.
Some common issues with window ACs include frequent on/off cycling, running non-stop, low refrigerant levels, and water leaking from the unit.
Here are some common issues with window ACs:
Repair Costs
The cost of repairing a window AC unit can vary widely, but on average, it falls between $60 and $250. This estimate includes the cost of replacement parts, which can range from $10 to $150, and labor costs, which can range from $50 to $150 per hour.
If you're considering hiring a handyman, be prepared to pay $50 to $80 per hour, plus the cost of materials. However, many HVAC professionals may not be willing to repair window units, as they consider them less worth their time.
The table below provides a summary of the average costs associated with repairing a window AC unit:
Repair Costs
The cost of repairing a window AC unit can vary greatly, but on average, it falls between $60 to $250. This estimate includes the cost of replacement parts, which can range from $10 to $150, and labor costs, which can be anywhere from $50 to $150 per hour.
If you're looking to DIY your window AC repair, you can save on labor costs, but be aware that some repairs may require professional expertise. A handyman can charge between $50 to $80 per hour, while an HVAC professional can charge upwards of $75 to $150 per hour.
Replacement parts for window units can cost anywhere from $5 to $250, with some components being more expensive than others. For example, a fan motor can cost between $100 to $250, while a filter can cost as little as $5.
Here's a breakdown of the average costs of different components:
It's worth noting that if your window AC unit needs multiple repairs or replacement parts, it may be more cost-effective to replace the entire unit. Additionally, if your unit is old or has parts that are no longer manufactured, repair costs can be higher.
NYC

In NYC, regular maintenance is key to keeping your window unit AC running smoothly. You'll want to clean the unit's filter and check for bugs or debris throughout the year.
Cleaning the condenser coils and water pan is also crucial, as it can help reduce the need for repairs. By doing this, you can also maximize your unit's cost and energy efficiency.
If you don't clean the condenser coils, frost or buildup can occur, which can lead to more serious issues down the line. Regular maintenance can help prevent these problems and keep your unit running at peak levels.
By having your unit serviced regularly, you can count on it to perform at optimal levels, especially during peak seasons. This can give you peace of mind and save you money in the long run.
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Professional Services
At Figlia & Sons, we pride ourselves on being a reliable HVAC company with over five decades of experience in providing window AC repair in NYC.
Our technicians are well-versed in leading industry standards and practices, ensuring that you receive top-notch service.
We've remained committed to putting our customers first since opening our doors in 1960, always striving to provide an unmatched level of service and expertise.
Expand your knowledge: Window Unit Ac Service
Decision Making
If your window AC unit is approaching the end of its lifespan, which is 8 to 10 years, it's usually best to get a replacement rather than trying to repair it.
The cost of repair should be compared to the cost of buying a new unit - if the repair will cost more than half the price of a new one, it's time to consider replacing.
For minor repairs like filter or fuse replacements, it's usually more practical to proceed with the repair rather than investing in a whole new unit.
However, if multiple parts like motors or control boards need replacement, the repair cost will likely exceed the price of a new window AC.
It's worth fixing a window air conditioner if the repair involves cleaning or replacing the filter or another inexpensive part.
If the repair will cost more than half the price of a new unit, or if multiple parts need replacement, it's not worth fixing the unit.
Worth a look: How Much Does It Cost to Repair an Ac Unit
Frequently Asked Questions
Is it worth it to service a window AC unit?
Yes, servicing a window AC unit is worth it, as it can significantly improve efficiency and reduce energy consumption. Regular maintenance can lead to lower energy bills and a smaller carbon footprint.
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