Living in Northern Illinois means preparing for everything from sweltering 90-degree July afternoons to bone-chilling February nights. In an area where the weather is notoriously unpredictable, your heating and air conditioning system works overtime to keep your family safe and comfortable.
At Kerley Heating & Cooling, we’ve spent over 60 years helping our neighbors in Rockford, Beloit, Loves Park, and Machesney Park maintain peak performance from their HVAC units. We know that the best repair is the one that never has to happen. That is why we’ve compiled this comprehensive guide to AC maintenance, furnace care, and smart homeownership.
Why HVAC Maintenance is Your Best Investment
Many homeowners view HVAC maintenance as an optional “extra,” but in reality, it is a critical investment in your home’s longevity. When you skip a seasonal tune-up, your system has to work harder to achieve the same results, leading to a cascade of negative effects.
Lower Utility Bills: A well-maintained AC or furnace operates at peak efficiency. When coils are clean and parts are lubricated, the system consumes less energy, which reflects directly on your monthly power bill.
Extended Equipment Life: Most HVAC systems are designed to last 15–20 years. However, without regular maintenance, that lifespan can be cut in half. Routine check-ups prevent the “cascading failure” where one worn-out part destroys the entire compressor or heat exchanger.
Improved Indoor Air Quality: Your HVAC system is the “lungs” of your home. Dust, pet dander, and allergens collect in your ducts and filters. Maintenance ensures you aren’t just recirculating dirty air.
The Kerley 5-Step DIY Maintenance Checklist
While professional service is essential, there are several things you can do to keep your system running smoothly between visits.
1. The 90-Day Filter Rule
The single most common cause of HVAC breakdowns is a dirty air filter. A clogged filter restricts airflow, forcing the motor to work harder and potentially causing the evaporator coil to freeze. We recommend checking your filter every 30 days and replacing it at least every 90 days—or more often if you have pets.
2. Keep the “Breathing Room” Clear
Your outdoor condenser unit needs plenty of space to disperse heat. Ensure there is at least two feet of clearance around the unit. Trim back any shrubs, weeds, or tall grass that might block airflow. In the fall, be sure to clear away fallen leaves and debris that can trap moisture and cause corrosion.
3. Inspect Your Drain Line
As your AC removes humidity from the air, that water has to go somewhere. It travels through a condensate drain line. Over time, algae and “sludge” can build up, leading to a backup that can cause water damage to your home. A simple flush with a bit of vinegar can help keep this line clear.
4. Monitor Your Thermostat
Sometimes the “breakdown” isn’t a mechanical failure but a communication error. Ensure your thermostat is set to the correct mode (Heat/Cool) and check the batteries. If you haven’t upgraded to a smart thermostat yet, doing so can save you up to 10% annually on heating and cooling costs by automating your home’s climate.
5. Listen for the Warning Signs
Your HVAC system will often tell you it’s struggling before it actually quits. Listen for unusual banging, squealing, or grinding noises. Pay attention to “short-cycling”—when the unit turns on and off frequently. If you notice these signs, it’s time to call in the pros at Kerley.
When to Call the Professionals: The Kerley Difference
Some tasks are best left to the experts. Handling refrigerants, high-voltage electrical components, and gas lines requires specialized training and licensing. At Kerley Heating & Cooling, our technicians are experts in:
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AC Repair & Installation: From rapid-response repairs to installing high-efficiency units that can withstand the Illinois humidity.
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Furnace & Heating Services: We specialize in furnace replacement and maintenance to ensure you’re never left in the cold during a Midwest blizzard.
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Ductless Mini-Splits: Perfect for home additions, sunrooms, or historic homes without existing ductwork.
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Indoor Air Quality Solutions: We offer air purifiers and ventilation maintenance to keep your home’s environment healthy.
Serving Rockford and Beyond Since 1964
As a family-owned and operated business, we treat our customers like neighbors. We aren’t just looking for a one-time service call; we want to be your lifelong HVAC partner. This commitment to honesty and reliability is why we have earned a 5-star reputation across Northern Illinois.
Our service area includes:
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Rockford & Loves Park
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Machesney Park & Beloit
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Rock City, Dakota, & Durand
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Roscoe & Rockton
Schedule Your Seasonal Tune-Up Today
Don’t wait for the first heatwave of summer or the first frost of winter to find out your system isn’t up to the task. Our Seasonal Maintenance Plans are designed to give you peace of mind, offering priority service and deep discounts on repairs.
Experience the comfort of a system that runs like new. Visit
