How Much Does a New HVAC System Cost in Middle Tennessee in 2026?

A complete new HVAC system — outdoor unit, indoor coil or air handler, and furnace — typically costs $7,500 to $15,000 installed in Middle Tennessee in 2026. Replacing just the outdoor air conditioner runs closer to $4,500 to $8,000, and a high-efficiency variable-speed system in a larger home can pass $18,000.

About these numbers: the ranges below are typical estimates for Middle Tennessee based on common job sizes and materials. They are not quotes. Your real price depends on your home, access, materials and the contractor you hire — always get two or three written estimates.

Typical HVAC replacement cost

What drives the number

• Size (tonnage). A 3-ton system for a 1,800 square foot house costs less than the 5-ton system a 3,400 square foot house needs. Sizing should come from a load calculation, not a guess.
• Efficiency rating. Base-efficiency equipment is the cheapest to buy. Higher SEER2 units cost more up front and cut summer power bills, which matters in a Tennessee August.
• Single-stage vs. variable-speed. Variable-speed equipment runs longer at lower output, which means steadier temperatures and much better humidity control — a real benefit here.
• Ductwork condition. Leaky, undersized or crushed ducts waste the new equipment. Duct repair or replacement can add $2,000 to $6,000.
• Access. Crawlspace and attic installations are slower and harder than a garage or closet unit.
• Extras that get bundled in. New thermostat, line set, condensate pump, surge protection, electrical work, permit and disposal.

What belongs in an HVAC estimate

• Equipment brand, model numbers, and tonnage for both indoor and outdoor units
• SEER2 and AFUE efficiency ratings
• Whether a load calculation was done to size the system
• Any duct work, sealing, or return air changes included
• New thermostat, line set, drain pan, and float switch
• Permit and inspection, plus who pulls it
• Manufacturer parts warranty and the installer's labor warranty
• Whether the first year of maintenance is included

Repair or replace?

A rough rule: if the unit is under 10 years old and the repair is a few hundred dollars, fix it. If it is 12 to 15 years old, uses R-22 refrigerant, and needs a compressor or coil, replacement usually wins. Older systems also cost more to run every month, so the comparison isn't only the repair bill.

Common questions

How long does an HVAC system last in Tennessee?

Air conditioners and heat pumps generally last 12 to 17 years here; gas furnaces often reach 18 to 25 years. Annual maintenance and correct sizing extend both.

Is a heat pump a good choice in Middle Tennessee?

Yes for most homes. Winters here are mild enough that a modern heat pump handles the season efficiently, and many are paired with backup heat for the coldest snaps.

How do I know if my system is the right size?

Ask for a load calculation, often called a Manual J. A contractor who sizes purely by "what was here before" may be repeating an old mistake.

When is the best time to replace?

Spring and fall. Crews are less slammed, scheduling is faster, and you're not making a rushed decision during a heat wave.

Are financing and rebates available?

Most established HVAC companies offer financing, and utility or manufacturer rebates often apply to high-efficiency equipment. Ask before you sign.

Find an HVAC company near you

Browse HVAC companies in Middle Tennessee, or start with your town: Murfreesboro, Nashville, Smyrna, or see all service areas.