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Why Your AC is Running Constantly

One of the most common summertime HVAC problem is a constantly running AC, which is not only annoying, but it also increases your electricity costs and puts stress on the unit.

Here are some of the top reasons why:

Improper Size and Installation A properly sized AC unit will keep your home comfortable and at maximum efficiency all summer long. An AC unit that’s too small or too large will cause issues with uneven cooling, inefficiency and rising electricity costs. Here are signs that your unit is over-running:

1. Unexpected increases in your electricity bill 2. Uneven cooling throughout the home 3. The AC unit runs for long periods of time, with little effect on the home’s temperature

Maintenance Irregular maintenance is one of the most common causes of AC inefficiency. It's recommended that you have your HVAC unit serviced twice per year, spring and fall. If your system is not clean, including your ducts, coils, and air filters, you will more than likely encounter airflow problems and inefficient cycling.

A few common maintenance issues include:

1. Dirty condenser 2. Clogged or restricted air filters 3. Low refrigerant charge 4. Dirty evaporator coils

Thermostat Problems If your system never shuts off, your thermostat may be the problem. The thermostat tells the AC unit the current temperature in your home, but when it's faulty, it may not be registering the temperature, leaving your AC constantly running and an unevenly cooled home.

Air Leaks Poor sealing or insulation may be the cause of your AC's inefficiency, causing air leaks and a drafty home. This causes your unit to work harder, causing strain and increasing your energy bills.

AC Unit Is Too Old When AC units reach the end of their lifespans, they become less efficient, working harder and longer to cool your home. Replacing it with an energy-efficient model will reduce run-time and save you money in the long-run.

If your AC is struggling this summer, Call 72 Degrees Comfort Company at 515-965-7272 or email us at

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