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

The cost to install a new AC and furnace with Cardinal Heating & Air is set case‑by‑case after an in‑home evaluation, and we provide upfront pricing with a free in‑home estimate. Most price differences come from sizing the equipment to your home and any upgrades needed so both systems run as one efficient pair; a right‑sized setup usually costs less to own than an oversized one that short‑cycles. Financing is available (furnace installs as low as $69/mo; AC or heat pump installs as low as $209/mo), and select replacements may qualify for up to $500 off. Our team regularly installs systems across the Greater Seattle area, including homes in Renton.

Your final quote typically reflects:

• Equipment efficiency and features (single vs variable‑speed)
• Ductwork changes or conversions
• Electrical, refrigerant line, and venting needs
• Thermostat, zoning, or indoor air quality add‑ons
• Access and installation complexity

If your current units fail often or can’t meet comfort needs, replacement usually beats ongoing repairs; schedule a no‑cost in‑home estimate to get a firm, written price before work begins. <br/> Updated: 2026-05-14 <br/> Need help in Renton, WA? Call (425) 827-9997 or book online.