How do I know if my furnace needs to be replaced?

Watch for: age over 15–20 years, repair bills approaching a third of replacement cost, rising gas bills, uneven heating, short cycling, rust or corrosion, and any heat exchanger concern — a cracked heat exchanger is a carbon monoxide risk and usually ends the repair-or-replace debate.

The Repair-Times-Age Rule

Multiply the repair estimate by the furnace’s age; if it exceeds the cost of a new unit, replacement usually wins. Modern furnaces reach up to 98% AFUE, so Chicagoland homes replacing a 20-year-old unit often cut heating costs significantly while gaining quieter, more even heat.

Why Northwest Suburbs Homeowners Choose All Set

All Set HVAC is the Northwest Suburbs’ local indoor air quality expert — home of the $99 Air Score Test. From air quality testing and purification to HVAC maintenance plans and new system installations, our licensed Arlington Heights technicians find the cause, fix it right, and back it with the All Set Guarantee. Call (847) 807-6100 or schedule your Air Score Test today.