When to Replace Your Air Conditioner

When summer temperatures climb in St. Louis, your air conditioner becomes one of the most important appliances in your home. But even the most reliable AC unit won’t last forever. Knowing when to replace your air conditioner can help you avoid unexpected breakdowns and costly repairs during the peak cooling season. At Galmiche & Sons, we combine decades of HVAC experience with industry expertise to help homeowners make smart, timely decisions about their cooling systems.

To learn more and for help selecting the best air conditioner unit for your home, contact our St. Louis heating and air conditioning experts today.

How Long Should an Air Conditioner Last?

The average lifespan of a central air conditioner is typically between 12 and 17 years. With proper maintenance, some systems may last a bit longer, but most units start showing signs of wear and inefficiency after about a decade. Age is a critical factor, but it isn’t the only reason to consider replacement. If you are wondering when to replace your air conditioner, look out for the following signs.

Common Signs You Need to Replace Your Air Conditioner

1. Frequent Repairs Are Adding Up

If you find yourself calling for AC repairs multiple times each season, it may be time to stop patching the problem and start thinking about a full replacement. Frequent air conditioner repair costs can quickly add up to more than the value of a new system.

2. Your Energy Bills Keep Rising

Older systems are significantly less efficient than today’s ENERGY STAR-rated air conditioners. If your AC bills are noticeably higher despite no change in usage, your aging AC may be working overtime just to keep up. Replacing it with a modern, high-efficiency unit can reduce your energy costs over time.

3. Uneven Cooling or Weak Airflow

If certain rooms in your home are hotter than others, or if you notice weak airflow from your vents and air conditioner repair doesn’t help, your system may be failing. These are signs that components like the blower motor or compressor may be struggling, which often precedes full system failure.

4. Strange Noises or Odors

Clanking, grinding, or rattling noises are more than just annoying. They often indicate internal damage or loose parts. Unpleasant smells, such as burning or musty odors, may signal mold, electrical problems, or burnt-out components. These issues can impact your indoor air quality and overall safety.

5. Your AC Uses R-22 Refrigerant

R-22 (also known as Freon) has been phased out due to environmental concerns. If your system still uses this refrigerant, finding R22 refrigerant replacements for repairs can be difficult and expensive. Upgrading to a new unit that uses environmentally friendly refrigerants is a smart move.

6. Your Home Comfort Is Declining

If your AC runs constantly but still doesn’t keep your home cool, it’s likely no longer up to the task. Older units lose efficiency, making it harder to reach or maintain your desired temperature.

How Galmiche & Sons Helps St. Louis Homeowners with Air Conditioner Replacement

Our team at Galmiche & Sons has been serving the Greater St. Louis area for decades. We provide comprehensive AC inspections and can help you determine whether it makes more financial and practical sense to repair or replace your air conditioner. We offer top-quality AC installation services and energy-efficient systems that deliver reliable, long-term comfort.

We can help with:

High utility bills caused by inefficient systems
Constant need for emergency AC repairs
Poor air distribution or system sizing issues
Outdated equipment that can’t meet modern cooling needs

FAQs: When to Replace Your Air Conditioner

Should I repair or replace my AC unit?

If your unit is over 10 years old and experiencing frequent issues, replacement is often the better long-term investment.

Can I wait until my AC breaks down before replacing it?

We don't recommend it. Waiting can leave you without cooling during the hottest part of the year, and emergency replacements are often more expensive.

Will a new AC system save me money?

Yes. Newer models are far more energy-efficient, which can significantly reduce monthly utility bills.

How do I know what size system I need?

Our technicians will perform a load calculation based on your home's size, insulation, and other factors to recommend the properly sized system.

Get Expert AC Replacement and Installation in St. Louis

Recognizing the signs of AC failure early helps prevent discomfort and saves you money. If you’re wondering when to replace your air conditioner, Galmiche & Sons is here to help. Contact us today to schedule an in-home consultation, request a quote for a new HVAC system or learn more about our professional AC installation services in the St. Louis area. Let us help you stay cool and comfortable all summer long.