Furnace Repair vs. Replacement: How to Decide

The Repair vs. Replace Decision

When your furnace breaks down, the biggest question is whether to repair the existing unit or invest in a new one. Here's a practical framework to help you decide.

The 50% Rule

If the repair cost exceeds 50% of the price of a new furnace, replacement is usually the smarter financial choice. For example, if a new furnace costs $5,000 and your repair quote is $2,800, it's time to replace.

Age Matters

Furnaces typically last 15-25 years. If yours is under 10 years old, repair almost always makes sense. Between 10-15 years, weigh the repair cost carefully. Over 15-20 years, lean toward replacement, especially if repairs are becoming frequent.

Efficiency Gains

If your current furnace is 80% AFUE (common in units from the 1990s and earlier), upgrading to a 96% AFUE model saves 15-20% on heating bills. For an average Utah home, that's $300-$500 per year, which adds up quickly over the new unit's 15-25 year lifespan.

The Heat Exchanger Exception

A cracked heat exchanger is almost always grounds for replacement. The repair is expensive ($1,500-$3,000), and a cracked heat exchanger poses a carbon monoxide risk. Most HVAC professionals recommend replacement when this component fails.

Our Recommendation

Get a professional diagnosis and a repair estimate, then compare it against replacement quotes. Our partner technicians provide honest assessments and won't push replacement when a simple repair will do.