5 Signs Your Old AC Is Costing You More Than a New One Would

Holding onto an aging air conditioner can feel like the frugal choice—why replace something that’s still running? But an old, inefficient AC often costs Marion homeowners far more than they realize, quietly draining money month after month through higher energy bills and repeated repairs. At some point, keeping the old unit alive costs more than replacing it.

So how do you know when you’ve crossed that line? Here are five signs from the team at Summers Plumbing, Heating & Cooling that your old AC may be costing you more than a new one would.

1. Your Energy Bills Keep Climbing

As an air conditioner ages, it loses efficiency—meaning it uses more electricity to deliver the same amount of cooling. If your summer energy bills keep creeping up even though your usage hasn’t changed, your old system is likely the reason. Older units often operate at much lower efficiency ratings than today’s models, and that gap shows up on every bill. A modern, high-efficiency system can significantly reduce your monthly cooling costs.

2. Frequent, Expensive Repairs

An occasional repair is normal. But if you’re calling for service every season—or facing a major repair like a compressor or coil replacement—those costs add up fast. A good rule of thumb: if a repair costs more than half the price of a new system, replacement is usually the smarter investment. Money poured into an aging unit is money you won’t get back.

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

Most air conditioners last around 10 to 15 years. Once a system passes the decade mark, it’s not only less efficient but also more likely to break down—and replacement parts for older models can become harder and more expensive to find. If your unit is in this age range and showing other warning signs, it’s worth having its efficiency evaluated.

4. Uneven Cooling and Comfort Problems

Are some rooms too warm while others feel like an icebox? Does your home never quite reach the temperature you set? An aging AC that struggles to keep up leaves you paying full price for partial comfort. A properly sized, professionally installed system delivers consistent cooling throughout your home—so you’re actually getting what you pay for.

5. It Uses Older R-22 Refrigerant

Air conditioners manufactured before 2010 often use R-22 refrigerant, which has been phased out of production. If your older system develops a refrigerant leak, recharging it with R-22 is now extremely expensive—when it’s available at all. If your AC still runs on R-22, a leak can quickly turn into a costly problem, making replacement the more sensible long-term move.

The Real Math: Repair vs. Replace

It’s tempting to keep patching an old unit, but those repair bills and inflated energy costs add up—often to more than the cost of a new, efficient system spread over its lifespan. A new AC isn’t just an expense; it’s an investment that lowers your monthly bills, reduces surprise repairs, and keeps your home comfortable and reliable.

The best way to know where you stand is a professional evaluation. At Summers Plumbing, Heating & Cooling, we’ve been helping Indiana families since 1969. We’ll assess your current system honestly and help you decide whether repair or replacement makes the most sense for your home and budget. Our Worry-Free Guarantee means we stand behind every installation, and our phones are answered 24/7.

Frequently Asked Questions

How do I know if I should repair or replace my AC?

A common guideline is the “50% rule”: if a repair costs more than half the price of a new system—or your unit is over 10 years old and needs frequent repairs—replacement is usually the better investment. A professional evaluation gives you the clearest answer for your specific situation.

How long does an air conditioner last?

Most central air conditioners last about 10 to 15 years with proper maintenance. After that, efficiency drops, breakdowns become more common, and parts can be harder to find, making replacement worth considering.

Will a new AC really lower my energy bills?

In most cases, yes. Modern high-efficiency systems use considerably less electricity than older units to deliver the same cooling. If your current system is a decade or more old, upgrading can noticeably reduce your monthly summer bills.

What is R-22 refrigerant, and why does it matter?

R-22 is an older refrigerant used in AC systems made before 2010. It’s been phased out of production, so recharging an R-22 system after a leak is now very expensive. If your AC uses R-22, a refrigerant leak can make replacement the more cost-effective choice.

What’s the best time of year to install a new AC in Marion?

Spring and fall are ideal. Milder weather means more scheduling flexibility and you avoid the peak-season rush—so you’re not waiting for a new system during the hottest days of summer. That said, we install year-round and can help whenever you need us.