What's the average cost to fix a furnace?

The short answer

Published national figures put most furnace repairs somewhere between $100 and $600. Bob Vila's cost guide gives exactly that span for the average repair, and Trane's guide describes repairs running from about $100 on the low end to $3,000 on the high end. The low end is a cleaned sensor or a new ignitor. The high end is a heat exchanger, which has an article of its own. Most furnaces, most of the time, land nearer the middle.

What a repair bill is made of

Every furnace repair is two things: a part and the time to install it. Bob Vila's guide puts typical HVAC technician labor at $75 to $150 an hour, and after-hours emergency work at $140 to $210. Parts run from a few dollars of bent metal to a circuit board worth more than the labor. A diagnostic fee usually comes first. Many companies, Bleuwave included, apply that fee toward the repair if you go ahead, so you are not paying twice for the same visit.

Typical ranges by part

Why the same repair costs different amounts

Four things move the number. The part is the obvious one. Access is the second: a furnace in a Phoenix attic is a different job from one in a hall closet, because attics are cramped and, for much of the year, brutally hot, and the same part simply takes longer to reach. Timing is the third, since nights, weekends and holidays carry after-hours rates. Age is the fourth. A furnace still inside its manufacturer's parts warranty may cost you only labor; an older one pays for both.

The Phoenix wrinkle

A furnace in Minneapolis runs for months. A furnace in Phoenix runs for a few weeks, then sits. That changes what breaks. Idle furnaces collect dust, their flame sensors foul and their ignitors fail on the first cold night. Those are among the cheapest repairs on the list, which is the good news. The bad news is that they tend to happen on the same few nights as everyone else's, when the phones are busiest. A fall furnace tune-up catches most of them before that night arrives.

When the repair isn't worth it

Bob Vila's guide offers a useful rule: if a repair costs more than 30 percent of the price of a new furnace, replacement is often the better investment. Its heat exchanger guide adds two more tests. Replace that part only in a furnace under about ten years old with no other problems, and think hard once total repairs pass half the furnace's value. Furnaces commonly last 15 to 20 years, it notes, and one near the end of that span is a poor place to put fresh money. If you are near the line, look at furnace installation and financing before you decide.

How we price it

A Bleuwave technician diagnoses the fault, shows you what failed and gives you a flat-rate price before any work begins. You approve it first. No meter running while someone thinks, no surprise on the invoice, and if the honest answer is a cleaned sensor, that is the answer you get. Book online and take $50 off any repair; the details are on our offers page. For the parts behind most of these calls, read the most common furnace repairs, and if the furnace has quit, start with furnace repair.