Why Your AC Is Running Constantly (And What to Do About It)

If your air conditioner seems like it never shuts off during the summer, you’re not alone. In Maryland’s heat and humidity, AC systems work hard — but they shouldn’t run nonstop all day and night. Constant operation is often a sign that something isn’t working efficiently. Understanding the causes can help you prevent higher energy bills, unnecessary wear and tear, and unexpected breakdowns.

Here’s why your AC may be running constantly — and what you can do about it.

1. Dirty or Clogged Air Filter

One of the most common causes is also the simplest. A clogged air filter restricts airflow, forcing your system to work longer to cool your home. When airflow is limited, your AC struggles to reach the set temperature, causing it to run continuously.

What to do:
Check your air filter and replace it if it’s dirty. Most homes should change filters every 1–3 months, especially during peak cooling season.

2. Incorrect Thermostat Settings

Sometimes the issue isn’t mechanical at all. If your thermostat is set too low — especially during extremely hot days — your AC may run continuously trying to reach a temperature that’s unrealistic for outdoor conditions.

What to do:
Set your thermostat to a reasonable temperature (typically 72–78°F in summer). If your system still struggles, it may be time to have it evaluated by professionals like Grove Heating and Cooling to ensure everything is calibrated correctly.

3. Poor Insulation or Air Leaks

If your home isn’t well insulated or has air leaks around windows and doors, cool air escapes while warm air enters. Your AC will keep running in an attempt to compensate for the lost cooling.

What to do:
Seal gaps around doors and windows and consider upgrading insulation. Improving your home’s energy efficiency reduces strain on your AC system.

4. Low Refrigerant Levels

Refrigerant is essential for absorbing and removing heat from your home. If levels are low — often due to a leak — your AC cannot cool effectively. As a result, it runs longer cycles trying to meet the thermostat setting.

What to do:
Refrigerant issues require professional attention. Licensed technicians, such as the team at Grove Heating and Cooling, can inspect for leaks, repair the issue, and properly recharge the system.

5. Dirty Coils

Over time, condenser and evaporator coils collect dirt and debris. Dirty coils reduce heat transfer efficiency, making your AC work harder and longer.

What to do:
Schedule professional maintenance. Regular cleaning improves system performance and helps prevent constant operation.

6. Undersized or Aging System

If your AC system is too small for your home, it may never fully reach the desired temperature during extreme heat. Similarly, older systems lose efficiency as components wear down.

What to do:
Have a professional perform a load calculation to determine if your system is properly sized. If your unit is 12–15 years old and running nonstop, it may be more cost-effective to consider replacement.

7. High Humidity Levels

Maryland’s humidity can make your home feel warmer than the actual temperature. If your system struggles to remove excess moisture, it may run continuously trying to maintain comfort.

What to do:
A whole-home dehumidifier or system evaluation from Grove Heating and Cooling can help balance temperature and humidity levels.

Why You Shouldn’t Ignore It

An AC that runs constantly isn’t just annoying — it increases energy bills, accelerates wear on components, and raises the risk of breakdowns during peak summer heat.

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The Bottom Line

While it’s normal for your AC to run more frequently during hot weather, it shouldn’t operate nonstop without reaching the desired temperature. From simple fixes like changing filters to more complex issues like refrigerant leaks or system sizing, identifying the root cause is key.

If your air conditioner won’t stop running, scheduling an inspection with experienced professionals like Grove Heating and Cooling can restore efficiency, protect your system, and keep your home comfortable all summer long.