Window Air Conditioner Not Blowing Cold Air but Running

window air conditioner Introduction:

A window air conditioner is a convenient and efficient appliance for cooling a room, but encountering a problem, such as the unit not blowing cold air even though it is running, can be frustrating. Several factors could contribute to this issue, ranging from simple to more complex problems. In this comprehensive guide, we will explore troubleshooting tips to help you identify and resolve the problem of a window air conditioner not blowing cold air while still running.

window air conditioner Here are some common materials used in the construction of window air conditioners:

Window air conditioners can be made with various materials, each serving a different purpose and providing different benefits. Here are some common materials used in the construction of window air conditioners:


Metal, typically steel, is commonly used for the outer casing or cabinet of window air conditioners. It offers durability and protection for the internal components. The metal casing is often treated with anti-corrosion coatings to prevent rusting.


Window air conditioners often feature plastic components for lightweight construction and insulation. Plastic is used for parts such as control panels, vents, fan blades, and grilles. It helps reduce the overall weight of the unit while maintaining structural integrity.


Copper is a key material used in the refrigeration cycle of window air conditioners. It is used in the refrigerant tubing and coils. Copper has excellent heat transfer properties, making it an efficient material for transferring heat between the indoor and outdoor units.


Aluminum is sometimes used for the condenser and evaporator coils of window air conditioners. It is a lightweight and corrosion-resistant material that further aids in heat transfer. Aluminum coils are often coated with anti-corrosive materials to enhance their longevity.

Insulation Foam:

Window air conditioners utilize insulation foam, typically made of closed-cell foam or polyurethane foam, to provide thermal insulation. This foam helps prevent warm air infiltration and reduces energy loss, improving the overall efficiency of the unit.

Electronic Components:

Window air conditioners contain various electronic components, such as circuit boards, wiring, sensors, and control panels. These components are often made of a combination of plastic, metal, and heat-resistant materials to ensure proper functioning and safety.

The specific materials used in window air conditioners may vary among manufacturers and models. They are chosen based on factors like performance, cost-effectiveness, durability, and efficient heat transfer. The combination of these materials contributes to the overall functionality and longevity of the window air conditioner.

window air conditioner Possible Causes for the Issue

Dirty Air Filter:

A clogged or dirty air filter restricts airflow and can hinder the cooling process, resulting in the unit not blowing cold air.
Inspect the air filter and clean or replace it if necessary.

Refrigerant Leak:

A refrigerant leak can cause a loss of cooling capacity in the air conditioner.
Look for signs of refrigerant leakage, such as oil spots or stains near the unit, and if detected, seek professional assistance to repair the leak and recharge the refrigerant.

Condenser Coils Are Dirty:

Dirty condenser coils can impede the heat exchange process, preventing the unit from cooling effectively.
Clean the condenser coils using a soft brush or vacuum cleaner to remove dirt, dust, and debris.

Troubleshooting and Resolutions

Check the Thermostat Settings:

Ensure that the thermostat is set to the proper cooling temperature.
Adjust the thermostat settings and wait to see if the air conditioner starts blowing cold air.

Inspect the Circuit Breaker:

Check the circuit breaker or fuse box to see if any tripped breakers or blown fuses may be affecting the air conditioner’s power supply.
Reset the breaker or replace the blown fuse as necessary.

Test the Capacitor:

The capacitor is responsible for starting the air conditioner’s compressor.
If the capacitor is faulty or weak, it can cause issues with the cooling process.
Contact a professional technician to test and replace the capacitor if needed.

Maintenance and Prevention

Regular Cleaning:

Routinely clean both the interior and exterior of the air conditioner to prevent dust and debris buildup, which can hinder performance.
Pay particular attention to the coils, vents, and filters.

Proper Insulation:

Ensure that the unit is properly insulated and sealed to prevent air leaks, which can affect its efficiency.
Insulate the area around the window where the air conditioner is installed to minimize heat gain.

Professional Maintenance:

Schedule regular professional maintenance to have the air conditioner inspected, cleaned, and tuned up.
This helps identify potential issues, ensure proper functioning, and extend the lifespan of the unit.

When to Seek Professional Help

Complex Repairs:

If the troubleshooting tips mentioned earlier do not resolve the issue, it might require professional knowledge and equipment to diagnose and repair the problem.
It is advisable to contact a certified HVAC technician to assess and resolve complex issues.

Warranty Coverage:

If your air conditioner is still under warranty, it is recommended to reach out to the manufacturer or authorized service center for repair or replacement options.

Here are the popular trends associated with window air conditioners:

Window air conditioners have seen some trends in recent years as technology and efficiency have advanced.

Energy Efficiency:

One of the key trends in window air conditioners is an emphasis on energy efficiency. Energy Star certified models have gained popularity due to their ability to reduce energy consumption and lower utility bills. Consumers are increasingly prioritizing energy-efficient models to minimize their environmental impact and save on costs.

Smart Technology:

The integration of smart technology into window air conditioners has become more prevalent. Smart features allow users to control and monitor their air conditioners remotely through mobile apps or voice assistances like Alexa or Google Home. These features offer convenience and greater control over temperature settings, timers, and energy consumption.

Quiet Operation:

Noise reduction technology has become a significant consideration for consumers. Window air conditioners with features such as specially designed fan blades, insulated cabinets, and advanced compressor technology aim to minimize noise levels. Quieter operation is essential, especially for bedrooms and other areas where noise can be disruptive.

Sleek Design:

Window air conditioners are now available in sleeker and more stylish designs. Manufacturers are focusing on creating units that blend well with modern interiors, featuring slim profiles, neutral colors, and hidden control panels. These aesthetically appealing designs make the units less obtrusive and more visually appealing.

Air Purification:

Some window air conditioners now include built-in air purifying features. These units have filters that can capture airborne particles, allergens, and odors, providing cleaner and healthier air. This trend is especially popular among consumers concerned about indoor air quality and allergies.

Dual Functionality:

Window air conditioners with heat pump capabilities have gained popularity as they provide both cooling and heating options in a single unit. This appeals to consumers looking for a year-round climate control solution, reducing the need for additional heating systems.

Eco-friendly Refrigerants:

The industry is gradually phasing out traditional refrigerants, such as R-22, due to environmental concerns. More window air conditioners now use eco-friendly refrigerants, such as R-410A, which have lower ozone-depleting potential and reduced global warming potential.

Window air conditioners continue to be a popular cooling solution for many households, offering convenience and affordability. As technology advances, the trends within window air conditioners are primarily focused on improved energy efficiency, smart features, quiet operation, attractive design, air purification, dual functionality, and environmental sustainability. Consumers have a wide range of options to choose from based on their specific cooling needs and preferences.


Encountering a window air conditioner that is running but not blowing cold air can be a frustrating experience. By following the troubleshooting tips provided, such as checking the air filter, cleaning condenser coils, and inspecting thermostat settings, you may be able to identify and resolve the issue. Remember to perform regular maintenance and seek professional assistance when necessary. By taking these steps, you can ensure the efficient and reliable performance of your window air conditioner, providing cool and comfortable air during hot summer days.

About the Author

You may also like these