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Apr 22 2025

Top Mistakes Homeowners Make with Their AC System

Summer is again drawing near the Chicagoland area. While the approach of sunny, warm days is exciting, it’s crucial to ensure your indoor space stays cool on scorching days with an AC system that can handle the heat. 

Many homeowners unknowingly make mistakes that reduce their AC’s performance and lifespan, leading to discomfort and costly repairs. Below, the experts at Van Drunen Heating & Air Conditioning share some of the most common AC mistakes and how to avoid them.

Common AC Mistakes:

  • Incorrect AC size 
  • Improper thermostat use 
  • Ignoring air filters 
  • Running AC at the wrong times 
  • Lack of regular maintenance 

By recognizing these issues, you can keep your home cooler, lower your energy bills, and ensure your system’s longevity. 

1. Incorrect AC Size

When it comes to air conditioners, size isn’t one-size-fits-all. An oversized AC is likely to turn on and off too quickly, leading to uneven cooling and increased energy consumption. On the other hand, a too-small unit will struggle to cool your home, running longer than necessary and wearing out faster. 

How to Prevent It 

Make sure your AC is appropriately sized and installed by professionals, like the team at Van Drunen Heating & Air Conditioning. 

2. Improper Thermostat Use

Misusing your thermostat by setting it too low or constantly adjusting the temperature means wasted energy and higher bills. 

The Solution 

Consider an investment in a programmable or smart thermostat to optimize settings. These devices can adjust automatically to maintain efficiency while keeping your home comfortable. Set separate schedules for when you’re home, asleep or away to maximize energy savings. 

3. Ignoring Air Filters

When air filters become full of dust and debris, your AC has to work harder to push air through. This not only reduces airflow but also leads to poor indoor air quality. 

How Often Should You Change Filters? 

Change or clean your filters every 1 to 3 months, depending on usage, season and whether you have pets. New or freshly cleaned filters will keep your system running efficiently and your air clean. 

4. Running the AC at the Wrong Times

Running your AC when it’s already cool outside, keeping it on with windows and doors open or leaving it on 24/7 is inefficient and, often, unnecessary. 

Optimize Your Usage

  • Use ceiling fans with your AC to circulate air and maintain comfort at higher thermostat settings. 
  • Turn off the AC when you open windows or doors, and vice versa.
  • Turn off the AC when you’re not home, or set it to a higher temperature. 

Smart systems can help here as well, as most have digital controls for adjusting settings on the go. 

5. Lack of Regular Maintenance

Skipping routine AC maintenance is one of the biggest mistakes homeowners make. Without regular check-ups, minor issues can go unnoticed until they turn into costly repairs. 

What Does Maintenance Include? 

Periodic maintenance should include cleaning coils, checking refrigerant levels, inspecting ducts for leaks, and ensuring the system is running efficiently. Scheduling an annual tune-up with a trusted HVAC professional, like Van Drunen Heating & Air Conditioning, is always a smart option. 

Stay Cool Without the Hassle

Avoiding these common mistakes will keep you comfortable this summer and help your AC run efficiently for years. Proper sizing, correct thermostat and system use, clean filters and regular maintenance are key ways to keep your system in top shape.

At Van Drunen Heating & Air Conditioning, we’re here to help you get your system summer-ready. From installation to tune-ups, count on us for quality service. Contact us today to stay cool all summer long!

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