With the onset of warm weather comes the inevitable need for cooling, and for many, a window air conditioner (AC) unit is a lifesaver. But what happens when that trusty appliance fails to do its job? A malfunctioning window AC unit can quickly turn a comfortable home into a sweltering nightmare. Before you break out into a sweat, let's delve into some common reasons why your window AC might not be working and how to troubleshoot them.
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5 Reasons Why Your Window AC Unit Isn't Working
1. Power issues
The first thing to check when your window AC unit isn't working is the power supply. Ensure that the unit is plugged in securely and that the power outlet is functioning correctly. Sometimes, a tripped circuit breaker or a blown fuse could be the culprit. Reset the breaker or replace the fuse if necessary. Additionally, inspect the power cord for any signs of damage, such as fraying or cuts, which may require professional repair.
2. Dirty air filters
A clogged or dirty air filter can significantly impair the performance of your window air conditioner. Over time, dust, dirt, and debris accumulate in the filter, obstructing airflow and reducing cooling efficiency. Check the air filter regularly and clean or replace it as needed, typically every one to three months depending on usage. A clean filter improves cooling and helps maintain indoor air quality.
3. Thermostat problems
Newer window AC's have separate thermostats to regulate the temperature. If the thermostat is faulty or not calibrated correctly, it can cause erratic cooling or prevent the unit from turning on altogether. Test the thermostat by setting it to a lower temperature than the current room temperature and listening for the compressor to kick in. If the compressor doesn't engage, the thermostat may need to be recalibrated or replaced.
4. Refrigerant leaks
Refrigerant is the lifeblood of an air conditioning system, absorbing heat from indoor air and releasing it outside. If your window AC unit is low on refrigerant due to a leak, it will struggle to cool effectively. Signs of a refrigerant leak include insufficient cooling, ice buildup on the coils, or hissing noises from the unit. If you suspect a refrigerant leak, it's best to contact a licensed HVAC technician to diagnose and repair the issue safely.
5. Blocked airflow
Another common issue that can hinder the performance of a window AC unit is blocked airflow. Ensure that the unit's vents and air intake are not obstructed by furniture, curtains, or other objects. Proper airflow is essential for efficient cooling, so keep the area around the unit clear to allow for adequate circulation of air.
3 Types of AC Systems to Replace Your Window Units
1. Ductless air conditioning
Ductless is like the new and improved version of window units: higher efficiency, higher comfort, and less noise. Ductless air conditioning, also known as ductless mini-splits, works by sending cool air to specific zones throughout the home. Rather than using bulky ductwork to function, ductless systems use small linesets to connect the outdoor unit to indoor air handlers, which are typically placed high on walls in different areas of the home. The air handlers can also be floor-mounted or ceiling-mounted.
Ductless systems offer zoning capabilities, with each unit controlled by its own thermostat. This allows for personalized temperatures in different areas of the home. Additionally, ductless systems can provide both cooling and heating by using a heat pump, serving as a versatile two-in-one solution for your home comfort.
2. Standard central air conditioning
Central air conditioning is a system in which air is cooled at a central location and distributed to and from rooms by one or more fans and ductwork. A standard central AC system consists of one outdoor unit and one indoor air handler that sends air through ducts to vents in rooms throughout the home.
One advantage of central AC is that is completely hidden inside your home. Air handlers are concealed -- typically in utility closets, basements, or attics. Conventional air conditioning is also more affordable option for homes that already have ductwork. If you have a gas or oil furnace for heat, then your home will already have ducts to distribute the warm air throughout the home.
A high-velocity system is a special kind of central AC that uses smaller ducts to disperse air at a higher speed. The small ducts can fit into any home, even those not apt for traditional ductwork. High-velocity systems also provides more even cooling and humidity reduction.
3. Heat pump central air conditioning
Central heat pump systems work the same as conventional air conditioning systems with one major difference: the outdoor can reverse its function in the winter and heat your home as well. Heat pumps are typically more efficient than standard HVAC systems and are perfect for homeowners that need both heating and cooling capabilities.
Conclusion
A malfunctioning window AC unit can be a source of frustration, especially during the hot summer months. By troubleshooting common issues like power supply problems, dirty filters, refrigerant leaks, thermostat issues, and blocked airflow, you can often identify and resolve the problem yourself.
Although we don't work on window air conditioners at ECI, our goal is to provide you with the tools to troubleshoot yourself. We offer free estimates for air conditioning systems if you're interested in ditching those window units. Schedule by clicking below!

If you live in the Delaware Valley/Greater Philadelphia area and would like to find comfort within your home, visit our website or give us a call at 215 - 245 - 3200 to learn more.