Why Does My Air Conditioner Run So Often?

Is your air conditioner running like it’s training for the Boston Marathon? Not only does this constant operation inflate your energy bill, it can also indicate potential problems.

How Long Should a Central Air Conditioner Run?

Understanding the ideal runtime for a central air conditioner is essential for maintaining the comfort and energy efficiency of your home. While there’s no one-size-fits-all answer, let’s look at some general guidelines.

Cycle Length

On average, a central air conditioner should run for about 15 to 20 minutes per cycle under typical conditions. This timeframe ensures that the unit efficiently cools the home and maintains optimal humidity levels.

Frequency

The number of cycles per hour can vary based on various factors, including the unit’s size, the outside temperature, and your home’s insulation. On a moderately hot day, you might expect 2 to 3 cycles per hour, translating to approximately 30 to 60 minutes of operation every hour.

Factors Influencing Runtime

Outside Temperature

On particularly hot Montana summer days, it’s natural for the AC to run more frequently or for longer cycles.

AC Unit Size

An appropriately sized AC will run in consistent cycles. An oversized unit might cool the house quickly but fail in humidity control, while an undersized unit will run almost continuously.

Home Insulation

Homes with effective insulation and sealing will retain cool air better, reducing the AC’s runtime.

Is Longer Runtime Ever Ideal?

While constant operation can signal problems, longer runtimes during peak summer days are expected. Moreover, a longer cycle can be beneficial for dehumidifying the air in especially humid regions.

When to Be Concerned

If your AC runs for very short bursts (less than 10 minutes) or seems to run indefinitely, it could indicate issues like improper sizing, thermostat malfunctions, or a need for maintenance.

Why Your AC May Be Running Longer Than It Should

Now, let’s dive into the reasons behind an incessantly running AC and some solutions to consider.

Incorrect Size for Your Home

When an AC unit that’s too small will struggle to reach the desired temperature, causing it to run continuously. When a central AC is installed, an HVAC expert must ensure the unit is the right size for your living space.

Thermostat Issues

If the thermostat is malfunctioning or incorrectly calibrated, it may send the wrong signals to your AC. Check if your thermostat is set to ‘auto’ and not ‘on.’ If it’s correctly set and the problem persists, it may need to be recalibrated or replaced.

Leaky Ductwork

Air ducts with leaks or holes can allow cool air to escape, making your AC work harder to maintain a comfortable temperature. An HVAC expert can inspect your ductwork for signs of gaps and holes, and ensure seals and connections are airtight. If the system is not sized correctly for your home, the ductwork can be redesigned to provide better air flow.

Dirty or Clogged Filters

Clogged filters restrict airflow, forcing your AC to work harder and longer to cool your home. Regularly check and replace or clean your AC filters, ideally every 1-3 months, or as recommended by the filter manufacturer, especially during peak usage times of year.

Older AC System

As central AC units reach the end of their lifespan, they often lack efficiency compared to newer models, leading to longer and more frequent operation.

If your unit is more than 10-15 years old, consider an upgrade. Today’s AC units are more energy-efficient, which can save you money in the long run.

Insulation and Sealing Issues

Poor insulation and gaps in doors or windows allow cool air to escape and warm air to enter, putting additional strain on your AC. Check your home’s insulation and seal any gaps or cracks around doors, windows, and walls. Thermal imaging smartphone apps can be a helpful way to locate air leaks by showing temperature differences around windows and doors.

Every home is unique, and several factors determine the ideal runtime for your central air conditioner. Regular maintenance and tuning can ensure it operates efficiently and effectively.

If you notice irregularities in your AC’s runtime or if you’re unsure about its performance, consult with an HVAC professional to ensure optimal operation and longevity.

For Air Conditioner Maintenance & Repair in Kallispell, Whitefish, Columbia Falls, Bigfork, Lakeside, Polson and the Surrounding Flathead Valley, Call 24/7