When to Repair and When to Replace Your HVAC System
N
NeedReno Staff
May 25, 2026
6 min read
48 views
A furnace repair might seem cheaper in the moment, but there is a clear point at which replacement is the smarter financial decision.
The call comes every winter: the furnace stops working and a technician quotes you $1,200 to fix it. Is that worth paying, or is it time to replace the whole unit?
Here is a clear framework.
**The 5,000 rule**
Multiply the age of your equipment (in years) by the repair cost. If the result exceeds $5,000, replacement is almost always the better financial decision.
Example: 15-year-old furnace × $1,200 repair = $18,000. Replace it.
Example: 5-year-old furnace × $600 repair = $3,000. Repair it.
**Age benchmarks**
- Furnaces: 15–20 years is end of life for most equipment
- Central A/C: 12–15 years
- Heat pumps: 15–20 years
- Water heaters: 8–12 years (tank) / 15–20 years (tankless)
**The efficiency argument**
A 20-year-old furnace runs at 60–70% efficiency. A new high-efficiency unit runs at 95–98%. If you're heating a Canadian home for $2,400/year, upgrading could save $600–$800 annually — meaningful payback over the unit's life.
**R-22 refrigerant: the hidden cost**
If your A/C uses R-22 refrigerant (common in units pre-2010), repair costs are significantly higher because R-22 is being phased out and is now expensive. A leak in a R-22 system is often the tipping point to replace.
**What to ask your HVAC contractor**
- What is the efficiency rating of the replacement unit?
- Are there rebates available (federal Greener Homes or provincial programs can cover $1,000–$5,000)?
- What is the labour warranty on the installation?
- Is this a repair that is likely to recur?
**Rebates are real money**
Canada's Greener Homes Grant program and various provincial programs provide meaningful rebates for high-efficiency HVAC upgrades. Always ask your contractor what you qualify for before deciding.
Here is a clear framework.
**The 5,000 rule**
Multiply the age of your equipment (in years) by the repair cost. If the result exceeds $5,000, replacement is almost always the better financial decision.
Example: 15-year-old furnace × $1,200 repair = $18,000. Replace it.
Example: 5-year-old furnace × $600 repair = $3,000. Repair it.
**Age benchmarks**
- Furnaces: 15–20 years is end of life for most equipment
- Central A/C: 12–15 years
- Heat pumps: 15–20 years
- Water heaters: 8–12 years (tank) / 15–20 years (tankless)
**The efficiency argument**
A 20-year-old furnace runs at 60–70% efficiency. A new high-efficiency unit runs at 95–98%. If you're heating a Canadian home for $2,400/year, upgrading could save $600–$800 annually — meaningful payback over the unit's life.
**R-22 refrigerant: the hidden cost**
If your A/C uses R-22 refrigerant (common in units pre-2010), repair costs are significantly higher because R-22 is being phased out and is now expensive. A leak in a R-22 system is often the tipping point to replace.
**What to ask your HVAC contractor**
- What is the efficiency rating of the replacement unit?
- Are there rebates available (federal Greener Homes or provincial programs can cover $1,000–$5,000)?
- What is the labour warranty on the installation?
- Is this a repair that is likely to recur?
**Rebates are real money**
Canada's Greener Homes Grant program and various provincial programs provide meaningful rebates for high-efficiency HVAC upgrades. Always ask your contractor what you qualify for before deciding.