St. Louis County License: MHV02516
Jefferson County License: M379

The Top Signs It's Time to Replace Your AC Unit

HVAC maintenance.
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When summer rolls into O’Fallon and the surrounding Metro East region, your air conditioner becomes one of the most important appliances in your home. But like any mechanical system, your AC unit has a lifespan—and eventually, repairs may no longer be enough. Knowing when it's time to replace your air conditioner can save you from high energy bills, unexpected breakdowns, and uncomfortable heatwaves.

At Heritage Heating & Cooling, we help homeowners recognize the red flags early and make informed decisions about their cooling systems. Here are the top signs that it might be time to replace your AC unit:

1. Your AC Is More Than 10–15 Years Old

Air conditioners are built to last, but most systems start losing efficiency after about a decade of use. If your AC is older than 10–15 years, especially if it runs on outdated refrigerant like R-22, it’s likely time for a replacement. New AC units are significantly more energy-efficient and environmentally friendly.

2. You’re Scheduling Frequent Repairs

If your AC needs constant fixing—especially for major components like the compressor or evaporator coil—you’re likely pouring money into a system that’s past its prime. Frequent repairs not only add up financially but also signal that your unit is struggling to keep up with demand.

3. Your Energy Bills Are Climbing

An air conditioner that’s losing efficiency will use more energy to cool your home. If you’ve noticed unexplained increases in your utility bills, your aging AC system could be the culprit. Replacing it with a high-efficiency model can lead to significant monthly savings.

4. Inconsistent Cooling and Hot Spots

Is one room freezing while another feels warm and stuffy? Uneven temperatures throughout your home could mean your AC unit is no longer able to distribute air properly. This might be due to worn-out components or a system that’s simply too old to perform well.

5. Strange Noises or Odors

Unusual sounds like grinding, squealing, or rattling can indicate serious internal issues. Likewise, musty or burning odors coming from your vents might point to mold growth or electrical problems. These are often signs that replacement is more cost-effective than continued repairs.

6. Humidity Issues Inside Your Home

A good AC system should regulate both temperature and humidity. If your home feels overly damp or muggy, it could be a sign that your unit is no longer dehumidifying effectively—a problem that typically worsens with age.


Get Expert Advice from Heritage Heating & Cooling

Not sure whether you need a repair or a full AC replacement? The licensed, insured, and EPA-certified technicians at Heritage Heating & Cooling are here to help. We proudly serve O’Fallon, Edwardsville, and the entire Metro East area with honest recommendations and expert installation.

Call us today at (618) 356-2781 to schedule a system inspection. We’ll help you stay cool, efficient, and stress-free this summer!

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