Evaluate · Heating
Should I repair or replace my furnace?
Repair if the furnace is under ~12 years old and the fix is minor. Lean toward replacement when the unit is 15+ years old, the repair approaches a third of replacement cost, or you're facing a major component like the heat exchanger or blower.
The Quick Answer
- Under 12 years + small repair → repair.
- 15+ years + major repair → replace.
- Repair nearing ⅓ of replacement cost → replace.
- Cracked heat exchanger → replace (safety).
The three numbers that decide it
Age of the furnace, the cost of the repair, and the furnace's efficiency. Together they tell you whether you're maintaining a good system or pouring money into a dying one.
Your options
Repair — when it makes sense
Your furnace is under ~12 years old, the repair is minor (igniter, flame sensor, capacitor), and it's been maintained. A small fix buys years of reliable service.
Replace — when it makes sense
The furnace is 15+ years old, the repair is major or recurring, efficiency is low (80% AFUE or less), or there's a cracked heat exchanger. A new 95–98% AFUE furnace cuts bills and resets reliability.
The middle path
If it's borderline, a temporary repair to get through the season while you plan a replacement on your schedule (better pricing, rebates, equipment choice) is often the smartest move.
Watch out for
Sunk-cost repairs
Multiple repairs on an old furnace often total more than a new one. Track what you've spent — don't let a string of 'small' fixes outrun a replacement.
Emergency replacement
Replacing during a January failure costs more and limits choice. If you're on the fence with an old unit, decide before deep winter.
Common questions
- What's the rule of thumb for repair vs replace?
- A common guideline: if the repair cost times the furnace's age in years exceeds about 5,000, replacement usually makes more sense. But age, efficiency, and safety matter too.
- Will a new furnace really lower my bills?
- Often yes — going from 80% to 96% AFUE means far less wasted gas, which adds up over a long Minnesota heating season.
- Can you just fix it for now?
- If it's safe to do so, we can make a temporary repair to get you through while you plan a replacement on your timeline.
Decision guidance from the master-certified team at A&E Heating & Cooling, based on real installs across the north Twin Cities metro · Last updated June 2026.
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