Repair or replace? How to decide on an aging furnace, AC or heat pump

Start with the repair itself

A worn capacitor, a failed igniter or a clogged condensate line is a routine fix. Those repairs are usually worth doing on almost any system that is otherwise running well. Bigger failures are different. A cracked heat exchanger, a failed compressor or a leaking coil on an older system is where replacement deserves a serious look.

Ask your technician to explain what failed, why, and whether it's likely to happen again. A good diagnosis should tell you if this is a one-off or a sign the system is wearing out.

Rules of thumb (and their limits)

A common rule of thumb is the 50% rule: if a repair costs more than half the value of a new system, replacement usually makes more sense. Another is to look at repair history. If you've paid for several significant repairs in the last couple of years, the next one is rarely the last.

These are starting points, not answers. A large repair on a fairly young system can still be worth it. A small repair on a system that never kept the upstairs comfortable may just be delaying a decision you'll make anyway.

Signs replacement is worth pricing

Any one of these is a good reason to get a replacement quote next to the repair quote:

• Safety concerns — a cracked heat exchanger, venting problems or carbon monoxide alarms on a gas furnace.
• Refrigerant issues — older AC and heat pump systems that use R-22, which is no longer manufactured, get expensive to recharge.
• Repeated breakdowns — multiple service calls in recent seasons.
• Hard-to-find parts — some older models have limited parts availability.
• Comfort problems — hot upstairs bedrooms, cold rooms, or a system that runs constantly in a cold snap.
• Noise, rising energy bills or a system that was never sized right in the first place.

Why the Puget Sound area changes the math

Replacing a failing furnace or AC is often the best moment to switch to a heat pump. You add cooling for summer heat waves and get efficient heating for our long, mild winters in one project. Many homes in Seattle, Bellevue, Kent and Tacoma that only had a furnace now want cooling, and a like-for-like swap doesn't give them that.

Planning ahead also helps. A replacement decided on a mild fall day gives you time to compare options and line up incentives. One decided during a January cold snap with no heat usually doesn't.

Incentives

Utility incentives can change the math more than any other line item. Seattle City Light and Puget Sound Energy both run heat pump incentive programs, and some Eastside cities add local programs on top. Eligibility depends on your utility, what you're replacing (gas, oil, electric resistance or an older heat pump) and the efficiency rating of the new equipment. We confirm what applies to your home during the estimate, show the price after incentives, and file the paperwork for you.

Financing

Financing doesn't change the total cost, but it changes what you pay each month. Many homeowners compare the monthly payment on a high-efficiency system against the energy savings it delivers. Our payment estimator on the financing page gives you a rough monthly number, and actual terms depend on credit approval and the lender.

How we handle repair-or-replace calls

When a technician finds a major problem, we explain it in plain terms, show you what we found and give you the repair price. If replacement is worth considering, we'll say so and can set up a separate in-home estimate with options side by side. You decide. If the repair is the right call, we'll do the repair.

If you're not sure yet, a maintenance visit is a low-pressure way to get an honest read on how much life your system has left.