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

The cost to install a new AC and furnace is project-specific and finalized after an in-home assessment. Most of the price comes from matching system size and efficiency to your home; an oversized or undersized setup can short-cycle and waste money. Scope also depends on ductwork condition, code requirements, and any needed electrical or gas work. We regularly right-size systems for Treasure Valley weather and altitude so you pay for what your home actually needs. Diamond Heating and Cooling provides free equipment estimates, free second opinions, financing options, and strong installation protections including a Two-Year Money Back Guarantee on new installs.

For a precise quote, your technician will consider:

• Home size, layout, and insulation
• Ductwork repairs, sealing, or replacement
• Electrical, gas line, and venting updates
• Thermostat or indoor air quality add-ons and access constraints

Schedule an on-site evaluation to receive a firm, itemized proposal for your home.

Updated: 2026-05-01

Need help in Middleton, ID? Call (208) 378-6624 or book online. "On installation day, Danny and crew arrived on time and did a great installation of the units we bought." — Mark O.