What Does Furnace Replacement Cost for Most Homeowners?

Furnace replacement cost for most homeowners varies by home and equipment and is only confirmed after an on-site assessment, though Ultimate Heating & Air, Inc offers heating system installs for as low as $120 per month with approved financing. The biggest price drivers are the furnace size your home needs, efficiency rating, and any work required to adapt ducts, vents, gas, or electrical. Our team replaces systems throughout the Boise–Garden City area and prices projects to local code and typical home layouts.

What most affects the final price:

• Capacity and efficiency: BTU size and AFUE rating
• Home readiness: duct modifications, venting/flue changes, gas or electrical updates
• Extras: thermostat upgrades, indoor air quality add-ons, and permit/inspection needs

If your unit has a cracked heat exchanger or repeated major failures, replacement often beats stacked repair costs; if issues are minor, a targeted repair may be smarter. A common field find: upsizing a furnace won’t fix cold rooms if undersized ducts restrict airflow. Schedule an in-home evaluation to receive a firm, written price.

Updated: 2026-10-23

Need help in Garden City, ID? Call (208) 738-4822 or book online. “He identified the problem and replaced the part to get our system functioning again.” — James W.