Repair or Replace? How to Decide on an Aging AC or Furnace

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The Five Inputs

Equipment age against expected life, the repair cost as a share of replacement cost, the refrigerant type, the realistic efficiency gain in your climate and utility rates, and whether you have unsolved comfort problems that a new box alone will not fix. Any contractor skipping these is selling, not advising.

Age Benchmarks

Air conditioners and heat pumps typically last 12 to 17 years, gas furnaces 15 to 25 years, and ductless mini-splits 12 to 18 years. Coastal salt air, poor maintenance and oversized equipment all shorten those numbers considerably.

The Refrigerant Question

If your system uses R-22, any repair involving refrigerant gets expensive fast because supply is phased out. A leaking R-22 evaporator coil is one of the clearest replace-now scenarios in residential HVAC.

Do the Cost Ratio Math

Repair when the cost is under roughly 30 percent of replacement and the unit is young. Think hard between 30 and 50 percent. Replace above 50 percent, or when a second major failure hits within a year or two.

Efficiency Gains Are Real but Oversold

Moving from a 10 SEER unit to a modern high-SEER2 system can cut cooling energy substantially, and in hot climates with high electric rates that alone can justify replacement. In mild climates with low rates, the payback stretches out and repair often makes more sense.

Fix the House, Not Just the Box

If you have hot upstairs rooms, a clammy basement or rooms that never get air, new equipment will disappoint you. Duct leakage, undersized returns, missing insulation and bad zoning have to be addressed in the same project or the comfort complaint survives the purchase.

What a Good Replacement Quote Includes

A load calculation rather than tonnage matching, static pressure measurement, a duct and line-set evaluation, permit and inspection handling, refrigerant recovery and recycling, warranty registration, commissioning readings on paper, and a clear itemized price with financing options.

Frequently Asked Questions

Should I replace the AC and furnace together?

If both are near end of life, yes, since matched systems perform better and one installation is cheaper than two. If the furnace is much newer, a coil-and-condenser replacement is often fine.

How long does installation take?

Most residential changeouts are one day. Adding ductwork, zoning or gas piping can extend it to two or three.

Will a bigger unit cool better?

Usually the opposite. Oversized equipment short cycles, leaves humidity behind and wears out faster.

Do you offer free replacement estimates?

Yes, with in-home evaluation and side-by-side repair versus replace numbers.

Still stuck? Get a technician today

We run 24/7 emergency AC repair and heating repair with flat-rate pricing and same-day or next-day appointments. Call (888) 380-4427 or request service online.