How much does it cost to install central air with ductwork?

Installing central air with new or modified ductwork is priced after an in‑home evaluation, but Russett Southwest offers AC installation financing as low as $120 per month. Most cost differences come from whether ducts must be built or resized and the cooling capacity your home needs.

Your total also reflects efficiency level, layout complexity, and any code or access constraints; we install and replace systems across the Tucson area with solutions tailored to each house. A common field finding is that undersized return ducts create high static pressure (air resistance), so resizing or adding returns can be necessary to protect the blower and improve comfort. Expect to repair when ducts are sound and the system is mid‑life, replace when the equipment is aging or ducts are failing, and plan upgrades when comfort issues persist across rooms. Financing options are available, including offers as low as $120/month on AC installation.

• Key cost drivers your technician will check:
• New duct build vs. reuse and sealing of existing ducts
• System size (tonnage) and SEER2 efficiency rating
• Attic/crawl access, insulation level, and return air sizing
• Add‑ons like zoning or indoor air quality components

Schedule an in‑home assessment to receive an exact written quote before work begins. <br/> Updated: 2026-04-11 <br/> Need help in Tucson, AZ? Call 520-200-5869 or book online.