Why Your AC Isn’t Cooling Your Home? - McMillin Air - Air Conditioning Repair Rervice

Why Your AC Isn’t Cooling Your Home?

Air conditioning systems are devices or mechanisms used to control and regulate the temperature, humidity, and air quality in enclosed spaces, such as homes, offices, vehicles, and industrial environments. These systems provide comfort by cooling the air during hot weather and heating it during cold weather.

In this article, you will find the answer to the question: why my AC is not cooling the house and what to do about it.

What Do You Need to Know About Air Conditioning Systems?

Air conditioning systems encompass more than just the condenser unit outside your home.

Components air conditioning systems:

  • Compressor. The compressor compresses refrigerant gas, raising its temperature and pressure.
  • Condenser. It is responsible for releasing heat from the refrigerant to the outside air. It is usually located on the outside of the house.
  • Evaporator. The evaporator absorbs heat from indoor air, cooling it down. It is usually located indoors.
  • Expansion valve. It controls the flow of refrigerant in the evaporator, regulating its pressure and temperature.
  • Refrigerant. Refrigerant is the substance circulating through the system, absorbing and releasing heat as it changes between liquid and gas states.

Types of air conditioning systems:

  • Central air conditioning. Central air conditioning systems are common in larger buildings and homes. They use a central unit to cool air and distribute it through ducts to various rooms.
  • Split system. Split systems consist of an outdoor unit containing the compressor and condenser, and an indoor unit containing the evaporator. They are popular for homes and small offices.
  • Window air conditioner. These units are self-contained systems installed in windows or through-the-wall openings.
  • Portable air conditioner. Portable AC units are movable and require minimal installation. They vent warm air through a hose and are suitable for cooling small spaces.
  • Ductless mini-split system. Similar to split systems, but without ductwork. They consist of an outdoor compressor/condenser unit and one or more indoor air-handling units mounted high on walls. They offer flexibility in zoning and are suitable for homes without ductwork.
  • Packaged terminal air conditioner (PTAC). Commonly used in hotels and apartment buildings, PTAC units are self-contained systems installed through walls. They provide both heating and cooling.
  • Variable refrigerant flow (VRF) systems. VRF systems use refrigerant as the cooling and heating medium and allow for individual control of indoor units. They are efficient and suitable for larger buildings.

Typical split-system air conditioners consist of various components such as an indoor air handler unit (furnace or fan coil), an evaporator coil, an air filter, a thermostat, and copper tubing (refrigerant lines) connecting indoor and outdoor units.

There are several potential reasons why your air conditioner might not be cooling effectively. However, don’t panic. Just because your system isn’t cooling doesn’t necessarily mean you’ll face costly repairs or need to replace the entire unit.

Many homeowners can perform basic troubleshooting to address the issue themselves. Yet, there are occasions where it’s best to contact your local McMillin Air dealer for professional air conditioner service.

10 Main Reasons Why My AC Isn’t Cooling the House

There are reasons why your air conditioner may be running but not cooling the air. Let’s take a look at them:

  1. Dirty air filters. One of the most common reasons for reduced cooling efficiency is dirty or clogged air filters. Dirty filters restrict airflow, reducing the system’s ability to cool effectively.

  2. Refrigerant issues. Low refrigerant levels due to improper charging or leaks can prevent the cooling process from proceeding on time. If your AC is low on refrigerant, it may not be able to absorb enough heat from indoor air to cool your home adequately.

  3. Faulty compressor. The compressor is responsible for circulating refrigerant in the air conditioning system. If it’s faulty or malfunctioning, the AC may not be able to cool the air properly.

  4. Condenser issues. If it’s dirty or obstructed by debris, it can’t dissipate heat efficiently, leading to reduced cooling performance.

  5. Thermostat problems. Incorrect thermostat settings or a malfunctioning thermostat can prevent the AC from running when it should or cause it to cycle on and off frequently, resulting in inadequate cooling.

  6. Blocked air vents or registers. Blocked or closed air vents and registers restrict airflow, preventing cooled air from reaching all areas of your home.

  7. Dirty evaporator coil. The evaporator coil absorbs heat from the air in the room. If it’s dirty or covered with debris, it can’t absorb heat effectively, reducing cooling efficiency.

  8. Poor insulation or air leaks. Inadequate insulation or air leaks in your home can allow warm air to enter and cool air to escape, making it harder for your AC to maintain comfortable temperatures.

  9. Overheating. If your AC unit is overheating due to excessive dirt buildup, a malfunctioning fan, or other issues, it may shut down or operate inefficiently, resulting in reduced cooling capacity.

  10. Age and wear. Older AC systems may experience declining performance due to worn-out components or general wear and tear over time.

To address these issues, you may need to clean or replace air filters, schedule professional maintenance to check refrigerant levels and clean coils, ensure proper thermostat settings, clear obstructions around the outdoor unit, and address any insulation or air leakage issues in your home. If problems persist, it’s advisable to consult with a qualified HVAC technician for further diagnosis and repair.

Maintenance and Care

Regular maintenance, including cleaning filters, and coils, and checking refrigerant levels, is crucial for the optimal performance and longevity of air conditioning systems.

Proper installation by qualified professionals ensures efficient operation and prevents issues like leaks and improper airflow.

Overall, air conditioning systems play a vital role in providing comfort and improving indoor air quality, but selecting the right system and maintaining it properly are essential for efficient and effective operation.

Professional Air Conditioning Service and Repair in Wickenburg, Arizona, USA

Allow the professionals at McMillin Air to address your air conditioning concerns. Our experienced team is equipped to handle any problem, including those caused by dust and debris accumulation.

Reach out to us at 623-432-5202 for prompt assistance and the answer to why my AC is not cooling the house. With our expertise, we can swiftly diagnose the issue and offer a reliable solution.


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22755 Hwy 71 Congress Az 85332