AC Repair vs. Replacement: When Is It Worth Fixing in the Bay Area?

The Quick Decision Rules

• The $5,000 rule: Multiply the repair cost by the age of the unit in years. If the result is over $5,000, lean toward replacement. (A $600 repair on a 10-year-old unit = $6,000 → replace.)
• The 50% rule: If a single repair costs more than half the price of a new system, replace it.
• The 10–15 year rule: Most central ACs last 12–15 years. Past 10, repairs stack up fast and efficiency drops.
• The R-22 rule: If your system uses old R-22 refrigerant, recharging it is now very expensive and being phased out. A leak on an R-22 system usually tips toward replacement.

When Repair Is the Right Call

Repair usually wins when the system is under about 8 years old, the problem is a wear part (capacitor, contactor, fan motor, thermostat), and it's the first major issue you've had. These are the systems with plenty of life left, and a few hundred dollars buys you several more years.

A failed capacitor or contactor, a clogged drain line, a worn fan motor, or a thermostat issue are all straightforward repairs that don't signal the end of the system. Fix them and move on.

When Replacement Makes More Sense

• The compressor failed — it's the most expensive part; on an older unit, replacing it rarely pencils out.
• You've had multiple repairs in the last two years — the trend is the signal.
• Energy bills keep climbing — older units lose efficiency; a modern high-SEER system can cut cooling costs meaningfully.
• It uses R-22 refrigerant — phased out, expensive to service, and a sign of an aging system.
• Rooms are unevenly cooled or the unit can't keep up on hot days — often a sizing or design problem a new system can correct.

The Bay Area Angle: Don't Just Replace Like-for-Like

Here's what a lot of homeowners across San Jose, Santa Clara, and the rest of the Bay Area miss: if your AC is failing and your furnace is also aging, replacing both with a single heat pump is often the smarter move. A heat pump both heats and cools, runs at far higher efficiency than older equipment, performs well in our mild climate, and qualifies for federal rebates of up to $2,000 plus possible state and utility incentives.

And if you have rooms that never cooled well, or an addition or ADU with no ductwork, a ductless mini split can solve a comfort problem that a straight central-AC swap would just repeat. The point: a breakdown is the right moment to fix the underlying comfort issue, not just restore the status quo.

Repair vs. Replace at a Glance

The Bottom Line

Repair a newer system with a simple fault. Replace an older one with a major failure, rising bills, or R-22 refrigerant — and when you do, look at whether a heat pump or mini split solves a bigger comfort problem at the same time. The right answer depends on your specific unit, so get a straight diagnosis before you spend.