Your furnace stopped working in the middle of a Detroit winter. A technician tells you it needs a major repair. Now you're asking yourself: should I fix it, or is it time for a new furnace? This is one of the most common questions we get at Cool Tech Comfort — and the answer isn't always obvious.
The $5,000 Rule for Furnace Decisions
Here's a simple formula heating professionals use: multiply the age of your furnace by the cost of the repair. If the result is more than $5,000, replacement is likely the smarter financial decision. If it's under $5,000, repair usually makes sense.
Example: Your 8-year-old furnace needs a $400 blower motor repair. 8 × $400 = $3,200 — well under $5,000, so repair makes sense. But if your 18-year-old furnace needs a $600 heat exchanger repair: 18 × $600 = $10,800 — replacement is worth serious consideration.
Signs Your Detroit Furnace Should Be Replaced
Age over 15-20 years. Most furnaces last 15-20 years with proper maintenance. If yours is in this range and has a major failure, a new high-efficiency system will pay for itself in energy savings within a few years.
Frequent repairs. If you've needed furnace repairs two or more times in recent years, the system is likely entering a pattern of decline. You're essentially paying to delay the inevitable replacement.
Rising energy bills. Older furnaces lose efficiency over time. If your heating bills have been climbing despite normal usage, your furnace is working harder than it should to produce the same heat.
Uneven heating. If some rooms in your Detroit home are warm while others are cold, your furnace may no longer have the capacity or efficiency to heat your home properly.
R-22 or outdated systems. Older furnaces using outdated components may be difficult or expensive to repair simply due to parts availability.
What Does a New Furnace Cost in Detroit MI?
A new furnace installation in Detroit MI typically ranges from $2,500 to $6,000 depending on the system type, efficiency rating, and installation complexity. High-efficiency 96% AFUE furnaces cost more upfront but can reduce your heating bills by 30-40% compared to an older 60-70% efficiency system.
Many Detroit homeowners are surprised to find that the monthly energy savings on a new high-efficiency furnace can offset a significant portion of the financing payment — making replacement more affordable than it appears.
When Repair Definitely Makes Sense
If your Detroit furnace is under 10 years old, well-maintained, and needs a routine repair like an igniter, capacitor, or thermostat — repair is almost always the right call. These repairs typically cost $150-$500 and can extend your system's life by many more years.
Cool Tech Comfort's technicians always give you an honest assessment. We'll never push you toward an unnecessary replacement. Call us at (313) 862-6662 for a furnace inspection and honest advice on whether repair or replacement is right for your Detroit home.