Should You Repair or Replace Your Furnace or AC?

A plain, honest framework for deciding, based on age, repair cost, safety and what you actually spend to run the system.

Call (740) 527-0222 Request a Call Back

Old furnace next to a new high-efficiency furnace

The quick rule of thumb

Multiply the age of the system by the cost of the repair. If the result is over about $5,000, replacement deserves a serious look. A ten-year-old furnace needing a $300 repair scores 3,000: fix it. An eighteen-year-old furnace needing a $700 blower motor scores 12,600: get a replacement price before you spend the money.

It is a starting point, not a verdict. The factors below can push the decision either way.

Age

Typical lifespans in central Ohio are roughly fifteen to twenty-five years for a gas furnace, twelve to seventeen years for a central air conditioner, and twelve to sixteen for a heat pump, which works year-round. Equipment near the end of that range is not guaranteed to fail, but each repair buys less time.

Safety

This one overrides the math. A cracked heat exchanger, severe corrosion in the burner area, or a furnace that cannot vent safely is a replacement, not a repair. We will always show you what we found. If we recommend replacement for safety, we will point to the specific problem, not a vague "it is old."

From the field

We are careful with the words "cracked heat exchanger," because the phrase has been used to scare homeowners into replacements they did not need. When we find one, we show you the crack with a camera or photos, and the combustion readings that go with it. If we cannot show you, we will not claim it.

Repair history

One repair in five years is normal. Three repairs in two years is a pattern. Frequent failures usually mean the whole system is wearing, not just one part, and the money spent chasing parts is money not going toward a system that will last.

Want a second opinion?

If someone told you to replace and you are not sure, call. We will give you an honest look.

Call Now

Refrigerant and parts

Air conditioners and heat pumps using R-22 refrigerant, installed before about 2010, are expensive to recharge because R-22 has not been produced since 2020. A refrigerant leak on an R-22 system is almost always the end of the line. Some older furnaces also use control boards and motors that are discontinued, which drives repair costs up.

Operating cost and comfort

A 20-year-old 80% furnace wastes about a fifth of the gas it burns up the chimney, and older models were often less efficient than their rating by the time they aged. A new condensing furnace is 95% or better. On the cooling side, a 2000s-era air conditioner can use noticeably more electricity than a current SEER2-rated model. Comfort matters too: if some rooms never heat or cool properly, a correctly sized replacement with a duct fix can solve problems no repair will.

From the field

A common story in the 1970s ranch homes around Heath and Newark: a furnace that has been repaired three winters in a row and a gas bill the owners assumed was just "what it costs." When the new, correctly sized furnace goes in, the first January bill often tells the rest of the story.

When repair is clearly the right call

The system is under ten years old.
The repair is a common, inexpensive part: flame sensor, igniter, capacitor, contactor, pressure switch.
There is no safety concern and the system has been reliable.
Your budget calls for getting through this season and planning a replacement later.

We will never push a replacement when a repair makes sense. See furnace repair and AC repair for what those visits involve.

When replacement is usually smarter

A furnace over about fifteen years old, or an AC over twelve, needing a major repair.
A cracked heat exchanger or unsafe venting.
An R-22 air conditioner with a leak.
A compressor failure on an AC or heat pump out of warranty.
Rising bills, uneven rooms and frequent repairs all at once.

Our cost guide lists typical Licking County prices for both repairs and new systems, and furnace replacement explains how we size and install.

Questions we hear

Repair vs. replace questions

How old is too old for a furnace?

Most gas furnaces last 15 to 25 years. Age alone is not a reason to replace a safe, reliable furnace, but past 15 years a major repair is a good moment to compare replacement costs.

Is a cracked heat exchanger always a replacement?

In practice, yes. Heat exchanger replacements are expensive and rarely make sense on an older furnace. Make sure the crack is actually shown to you before you commit.

Should I replace my furnace and AC together?

If both are near the end of their lives, replacing them together saves on labor and gives you a matched, more efficient system. If one is fairly new, you can usually replace just the other.

Is it worth repairing an R-22 air conditioner?

For electrical repairs like a capacitor, yes. For a refrigerant leak, usually not, because R-22 is expensive and the system is typically near the end of its life anyway.

What is the 5,000 rule?

Multiply the equipment age by the repair cost. If it is over about 5,000, replacement is usually worth pricing out. It is a guideline, not a hard rule.

Free estimates · No obligation

Get an honest recommendation

Calling is the fastest way to get on the schedule. Tell us what the system is doing and we will tell you what it probably is, what it probably costs and when we can be there.

(740) 527-0222

Rather not call right now? Leave your name and number and we will call you back.

Request a call back

We usually call back within the hour during business hours.