Why Is My AC Not Cooling My House?

If you find that your AC unit is not cooling your house, there can be several things you’ll want to check before calling an HVAC service company. In this article, we’ll explore common reasons why your AC might not be cooling your home as expected and provide a comprehensive troubleshooting guide to help you identify and resolve the problem.

Troubleshooting Guide

When your air conditioning system fails to cool your home adequately, it can be a frustrating experience, especially during hot summer days. However, before you panic or rush to call a professional, it’s essential to troubleshoot the issue systematically. Here’s a detailed guide to help you pinpoint the problem and potentially resolve it yourself:

Check Thermostat Settings

Verify the Mode

First, make sure that the “cool” setting on your thermostat is selected rather than “heat” or “off.” Adjustments or programming errors can accidentally cause the thermostat to operate incorrectly.

Adjust the Temperature

Verify the thermostat’s temperature setting. The thermostat should be set lower than the current room temperature to trigger the cooling cycle. If the temperature is too high, your AC may not kick in.

Fan Setting

Confirm that the fan setting is “auto” rather than “on.” When set to “auto,” the fan operates only when the cooling system is actively cooling the air. If set to “on,” the fan will run constantly, even when the system is not actively cooling.

Inspect Air Filters

Locate the Filters

Find the air filters in your HVAC system. Typically, they are located near the return air duct or inside the air handler unit.

Check for Dirt and Debris

Remove and inspect the air filters for dirt, dust, or debris. These particles may build up and obstruct airflow over time, decreasing the effectiveness of your air conditioning system.

Replace or Clean Filters

If the filters appear dirty or clogged, it’s time for replacement or cleaning. Refer to your HVAC system’s manual for instructions on proper filter maintenance. Generally, filters should be replaced or cleaned every 1 to 3 months.

Examine the Outdoor Unit

Turn Off Power

Before inspecting the outdoor unit, turn off the power to your AC system to avoid any electrical hazards.

Clear Obstructions

Check the area around the outdoor unit for possible airflow obstructions, such as leaves, dirt, or debris. These obstructions can restrict airflow and hinder the unit’s ability to dissipate heat effectively.

Clean the Unit

To remove dirt and debris, lightly mist the outdoor unit with a garden hose. Do not use high-pressure water, as this can damage delicate components.

Check for Refrigerant Leaks

Look for Signs: Look for leaks in the refrigerant lines and parts, such as corrosion, oil stains, or hissing noises.

Use a Leak Detector: If you suspect a refrigerant leak, use a leak detector or soap bubbles to locate the source of the leak. Be cautious when handling refrigerant, as it can harm your health and the environment.

Seal the Leak: Once you’ve identified the leak, seal it using appropriate sealants or patching materials. Depending on how bad the leak is, you might need to hire a qualified HVAC specialist to fix it.

Clean the Condenser Coils

Locate the Coils: Condenser coils are located in the outdoor unit. These coils are typically located behind the array of thin metal fins common to all air conditioning systems. Before beginning, ensure the electrical power is off. Often, there will be protective grilles or covers enclosing the coils.

Inspect and Clean the Coils: To access the coils, you may need to remove any protective grilles or coverings present. Inspect and remove any large debris that may be present and hindering airflow during normal operation. Gently apply a soft brush or a vacuum with a brush attachment to the condenser coils to remove dirt, debris, and dust. Take care not to bend or harm the fragile fins.

Rinse with Water: Once any debris has been removed, rinse the coils and fins with running water. Again, the importance of ensuring the power to the unit is turned off cannot be stressed enough. Direct the water flow from the inside out to remove any remaining debris. Be careful not to spray water directly at or near electrical components or areas.

With the use of the troubleshooting steps outlined above, you can diagnose and potentially resolve common issues that cause your AC system to malfunction and fail to cool your home effectively. However, if you cannot identify or fix the problem independently, don’t hesitate to contact a professional HVAC technician for assistance. It’s best to take care of AC problems as soon as possible to prevent further damage and ensure your house stays cool and cozy.