Why Your AC System Runs Constantly in San Antonio and Austin

¡Hola! Living in San Antonio or Austin, Texas, means relying heavily on your air conditioning system to stay comfortable in the scorching summer heat. But what happens when your AC runs 24/7 and never seems to shut off? Not only can this drive up your energy bills, but it may also signal an underlying issue with your system. Below, we explore the common reasons your AC might be running constantly and what you can do about it. Here are some things that might be causing it!

1. Incorrect Thermostat Settings

One of the most common reasons your AC runs non-stop is improper thermostat settings. If the thermostat is set too low, especially during the hot Texas summer, your AC may struggle to reach the desired temperature, causing it to run continuously. Additionally, if the thermostat is in “fan” mode instead of “auto,” the fan will keep running even when the cooling cycle is complete.

Solution: Check your thermostat settings. Set it to a reasonable temperature (around 78°F is energy-efficient for Texas summers) and ensure the fan is set to “auto.” If the problem persists, your thermostat may need recalibration or replacement.

2. Dirty Air Filters

Clogged or dirty air filters restrict airflow, making it harder for your AC to cool your home. When airflow is reduced, the system has to work harder and longer to maintain the set temperature, leading to constant operation.

Solution: Replace or clean your air filters every 1-3 months, especially during peak usage seasons. This simple maintenance task can improve efficiency and prevent overworking your AC.

3. Low Refrigerant Levels

Your AC relies on refrigerant to absorb and remove heat from your home. If there’s a leak or the system is low on refrigerant, it can’t cool effectively, causing the unit to run constantly in an attempt to reach the desired temperature.

Solution: Low refrigerant is not a DIY fix. A professional technician needs to locate and repair any leaks, then recharge the system with the correct amount of refrigerant.

4. Undersized AC Unit

If your AC unit is too small for your home, it may not have the capacity to cool the space effectively. This is especially common in older homes or after home additions that increase square footage. An undersized unit will run continuously without adequately cooling your home.

Solution: Have a professional assess your home’s cooling needs. You may need a larger unit or additional cooling solutions, such as a ductless mini-split system.

5. Dirty Condenser Coils

The outdoor condenser unit can accumulate dirt, leaves, and debris, especially in dusty areas like San Antonio and Austin. Dirty condenser coils prevent the system from releasing heat efficiently, forcing the AC to run longer to cool your home.

Solution: Schedule regular maintenance to clean the condenser coils. A professional can also check for other issues with the outdoor unit.

6. Leaky Ductwork

Leaky or poorly insulated ducts can cause cooled air to escape before it reaches your living spaces. This forces your AC to work overtime to compensate for the lost air, resulting in constant operation.

Solution: Have your ductwork inspected and sealed by a professional to ensure efficient airflow throughout your home.

7. Aging or Failing AC System

If your AC is over 10-15 years old, it may be losing efficiency or struggling to keep up with cooling demands. Aging systems are more prone to breakdowns and may run constantly as components wear out.

Solution: Consider having your system evaluated by a professional. It may be time to repair or replace your unit to restore efficiency and comfort.