Wiring vs furnace repair: Home safety upgrades
Old wiring and aging furnaces are the two leading causes of house fires. If your home needs both, learn which to address first and how to budget effectively.
Both outdated wiring and a failing furnace are safety hazards, but they manifest differently. Electrical fires from old wiring (especially knob-and-tube or aluminum wiring from the 1960s–70s) cause an estimated 47,000 house fires per year in the US, often starting inside walls where they're invisible until they break through. A cracked furnace heat exchanger, meanwhile, can leak carbon monoxide — an odorless gas responsible for 400+ deaths per year. Both are urgent, but the triage depends on your specific symptoms. If you're experiencing flickering lights, warm outlets, burning smells, or frequently tripping breakers, the electrical system is the higher priority — these are active warning signs of a fire hazard. If your furnace is making banging noises, producing a yellow instead of blue flame, or triggering CO detector alerts, the furnace takes priority — carbon monoxide can be lethal within hours. If both systems are simply old but not showing active symptoms, prioritize by age: knob-and-tube or aluminum wiring should be replaced regardless, while furnaces typically last 15–20 years. For homes that need both, many homeowners do electrical first (since it often requires opening walls) and schedule furnace work afterward, allowing a single round of drywall repair.
Wiring vs Furnace repair
| Feature | Wiring | Furnace repair |
|---|---|---|
| Best for | Prioritize wiring when: your home has knob-and-tube wiring (pre-1950s), aluminum branch wiring (1960s–70s), or a fuse box instead of circuit breakers. When outlets are warm to the touch, lights flicker without explanation, you smell burning near outlets or the panel, or breakers trip frequently. A full rewire for a 2,000 sq ft home costs $8,000–$15,000. A panel upgrade from 100A to 200A costs $1,500–$3,000. Partial rewiring (one floor or high-risk circuits) runs $3,000–$8,000 and can be a practical first step if budget is tight. | Prioritize furnace repair when: the furnace is over 15 years old and showing performance problems. When you hear banging, popping, or screeching noises during operation. When the pilot light or burner flame is yellow instead of blue (indicates incomplete combustion and possible CO production). When CO detectors have alarmed. When heating bills have spiked without usage changes. A furnace tune-up costs $80–$150. Heat exchanger inspection runs $100–$300. A cracked heat exchanger typically means replacement — a new high-efficiency furnace costs $3,000–$6,000 installed, but qualifies for federal energy tax credits of up to $600 and often utility rebates of $200–$1,000. |
Call a Wiring when…
Prioritize wiring when: your home has knob-and-tube wiring (pre-1950s), aluminum branch wiring (1960s–70s), or a fuse box instead of circuit breakers. When outlets are warm to the touch, lights flicker without explanation, you smell burning near outlets or the panel, or breakers trip frequently. A full rewire for a 2,000 sq ft home costs $8,000–$15,000. A panel upgrade from 100A to 200A costs $1,500–$3,000. Partial rewiring (one floor or high-risk circuits) runs $3,000–$8,000 and can be a practical first step if budget is tight.
Call a Furnace repair when…
Prioritize furnace repair when: the furnace is over 15 years old and showing performance problems. When you hear banging, popping, or screeching noises during operation. When the pilot light or burner flame is yellow instead of blue (indicates incomplete combustion and possible CO production). When CO detectors have alarmed. When heating bills have spiked without usage changes. A furnace tune-up costs $80–$150. Heat exchanger inspection runs $100–$300. A cracked heat exchanger typically means replacement — a new high-efficiency furnace costs $3,000–$6,000 installed, but qualifies for federal energy tax credits of up to $600 and often utility rebates of $200–$1,000.