Repair or replace your HVAC? An honest rule of thumb.

HVAC · 4 min read · By the OutToday team

Nobody wants to spend thousands on a new system, and nobody wants to keep throwing money at an old one. Here's a simple way to think it through before you talk to anyone who's selling something.

The $5,000 rule

Multiply the age of your system in years by the cost of the repair. If the number is more than $5,000, replacement usually makes more sense. If it's less, repairing is usually the smarter call.

• A 6-year-old system with a $400 repair: 6 x $400 = $2,400. Repair it.
• A 16-year-old system with a $700 repair: 16 x $700 = $11,200. Start planning a replacement.

It's a rule of thumb, not a law, but it keeps you from paying real money to keep a tired system alive.

The 10-year mark

Most furnaces, air conditioners, and heat pumps are designed to last roughly 10 to 20 years, depending on the equipment and how well it was installed and maintained. Once a system passes about 10 years, repairs tend to get more frequent and parts get harder to find. That's the point to start asking whether the next repair is the last one worth making.

Signs replacement is likely the better move

• Repairs are happening more than once a year
• Your energy bills are climbing without a change in how you use the system
• Some rooms never get comfortable, no matter how the system runs
• Your air conditioner uses R-22 refrigerant (typically older systems) and needs a recharge, which is increasingly expensive
• The system is loud, short-cycling, or struggling on the coldest and hottest days

The one symptom that means stop repairing

A cracked heat exchanger in a gas furnace. The heat exchanger keeps combustion gases, including carbon monoxide, separate from the air you breathe. When it cracks, the safe answer is almost always to replace the furnace, not repair it. If a technician tells you the heat exchanger has failed, ask to see the crack, and get a second opinion if you're not sure. Either way, don't keep running a furnace with a suspected crack.

Repair or replace: three questions to ask

1. What exactly failed, and can you show me?
2. What is the written price to repair it, and what is the written price to replace the whole system?
3. If I repair this, what else is likely to fail next?

A good technician will answer all three plainly, give you both prices in writing, and let you decide.