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

The cost to install a new AC and furnace with Ultimate Heating & Air, Inc is confirmed after an in‑home evaluation because system size, efficiency level, duct condition, and utility connections determine the price. Most projects cost more when significant duct changes or electrical/gas upgrades are required, while like‑for‑like replacements tend to run lower. Replacing both at once can trim labor overlap and ensures the equipment is properly matched for airflow and controls. Our team frequently installs matched systems across the Treasure Valley, including homes in Kuna, so proposals reflect local home designs and climate. If you want budget flexibility, current offers include AC or furnace installs as low as $120/month with a free proposal (conditions apply). If your compressor or heat exchanger is failing or repairs are piling up, replacement is usually the smarter move; otherwise, get a diagnostic first. Schedule a free proposal to receive a written, itemized quote after we measure your home.

Updated: 2026-05-04

Need help in Kuna, ID? Call (208) 738-4822 or book online. “Very happy with Ultimate Heating, from the initial appt & quote to the installation & completion schedule.” — Paul S.