Repair or Replace? How to Decide When Your AC Is on Its Last Legs

Your AC just died on the hottest week of the year. The tech gives you two numbers: $1,800 to repair, $6,500 to replace. You need to make a decision fast because it's 94 degrees in your living room and the dog is lying on the tile floor looking at you like you've betrayed him.

Here's a straightforward framework for making this call without getting pressured into a sale you don't need.

The 50% Rule

This is the simplest guideline in the industry, and it works. If the repair cost is more than 50% of what a new unit would cost, replace it. A $3,000 repair on a system you could replace for $5,500 doesn't make financial sense. But a $400 capacitor replacement on that same system? Repair it every time.

For context, here's what common AC repairs actually cost in Los Angeles:

• Capacitor replacement: $150-300
• Contactor replacement: $200-400
• Fan motor: $350-650
• Compressor replacement: $1,400-2,500
• Evaporator coil: $1,200-2,200
• Full system replacement (3-5 ton): $5,500-12,000

Notice the gap between the minor repairs and the major ones. Most AC problems fall into the under-$500 category. Those are almost always worth fixing regardless of age.

Age Matters, But Not as Much as You Think

The average central AC system lasts 15-20 years in Southern California. Our mild winters and heavy summer use put us right in the middle of the national average. But "average" doesn't mean your unit will die at 15 years. We service systems in Calabasas and Beverly Hills that are 22+ years old and running strong because the owners maintained them.

Here's a rough guide:

• Under 10 years old: Repair almost anything. The system has plenty of life left. Even a compressor replacement makes sense.
• 10-15 years old: Repair minor issues. For major components (compressor, evaporator coil), weigh the cost carefully using the 50% rule.
• 15-20 years old: Minor repairs are fine, but if you're facing a $1,500+ repair, it's time to start shopping. You'll recoup the cost in energy savings within 3-5 years.
• Over 20 years: Unless it's a simple fix, you're better off replacing. The efficiency gains alone (modern units use 30-50% less electricity) will pay for themselves.

The R-22 Refrigerant Problem

If your system was installed before 2010, there's a good chance it uses R-22 (Freon) refrigerant. R-22 was phased out of production in January 2020. The remaining supply is recycled and increasingly expensive. A refrigerant recharge that cost $300 five years ago now costs $800-1,500 for R-22 systems.

If your AC has a refrigerant leak and uses R-22, this is one of the strongest arguments for replacement. You'll keep paying inflated prices every time it needs a recharge, and eventually the supply won't be available at any price. Newer systems use R-410A or R-454B, which are readily available and environmentally compliant.

Warning Signs Your AC Is Dying

Sometimes the decision is obvious. These are the signals that your system is telling you it's done:

• Frequent repairs: Two or more breakdowns in the same cooling season. That $400 fix in June plus the $600 fix in August adds up fast.
• Rising energy bills: If your DWP or SoCal Edison bill jumped 20-30% with no change in usage, your system is losing efficiency. A dying compressor draws more power trying to keep up.
• Uneven cooling: Some rooms are 72, others are 80. This often means the system can no longer handle the load or the ductwork has deteriorated.
• Strange smells: Musty or burning smells from the vents can indicate mold in the system or electrical components overheating. Both are serious.
• Short cycling: The system turns on for 5-10 minutes, shuts off, then turns on again. This hammers the compressor and drives up your bill.

What a Good HVAC Company Won't Do

A company worth your business won't walk in and immediately push a $10,000 replacement. They'll diagnose the actual problem, give you the repair cost, and have an honest conversation about whether it makes sense given the age and condition of your system.

We've told plenty of customers in LA to repair rather than replace, even when a new sale would have been more profitable for us. That's how you earn the kind of trust that keeps people calling you for 40 years.

Whether you need a quick AC repair or want an honest assessment of your system, our HVAC team is available 7 days a week across Greater Los Angeles. We'll give you real numbers and let you make the call.