How much does it cost to install a new AC and furnace?

G&C Plumbing & Heating provides exact pricing for a new AC and furnace only after an in-home evaluation because total cost depends on system size, efficiency, and your home’s existing setup. The most common drivers are correct system sizing and whether any ductwork or venting changes are needed. We give clear, written estimates and explain options before work begins, and every install includes a 2-year warranty (4 years for Priority Plan members). Our team regularly installs systems for homeowners throughout the Waltham area. Replacing both units together can streamline setup and controls, but we confirm what makes sense after inspection.

Typical factors that move price up or down:

• Home size and the load calculation needed
• Efficiency ratings and model tier you choose
• Ductwork, electrical, or condensate and venting updates
• Thermostat, zoning, and air quality add-ons

$300 off air conditioning replacement is available for new system installs; present the coupon, one-time use, not combinable, expires 2026-05-06. Schedule an in-home assessment to get a firm, line-by-line quote.

Updated: 2026-05-02

Need help in Waltham, MA? Call (508) 571-6488 or book online.