How Much Does a New AC Unit Cost?

Q: How long does a central AC unit last?

Most central AC units last 15-20 years with proper maintenance. Units in hot climates may need replacement sooner.

Q: What SEER rating should I get?

For most climates, 16-18 SEER offers the best balance of upfront cost and energy savings. In very hot regions, 20+ SEER may be worth the premium.

Last updated February 15, 2026

If your air conditioner is over 12 years old or struggling to keep up, replacement is usually more cost-effective than repair. Here are installed costs for central AC units in 2026.

Typical Costs

2-Ton Unit (1,000-1,500 sq ft)

$4,500

$3,500 avg $5,500

3-Ton Unit (1,500-2,000 sq ft)

$5,500

$4,500 avg $6,500

4-Ton Unit (2,000-2,500 sq ft)

$6,500

$5,500 avg $7,500

5-Ton Unit (2,500-3,500 sq ft)

$7,500

$6,500 avg $9,000

What Affects the Cost?

Unit Size (Tons): A Manual J load calculation determines the right tonnage. Undersized units run constantly; oversized units short-cycle and waste energy.
SEER Rating: Minimum efficiency is 15 SEER (2023+ regulation). Units rated 18-22 SEER cost more but save significantly on cooling bills.
Brand: Premium brands (Carrier, Trane, Lennox) cost 20-40% more than value brands (Goodman, Rheem) with comparable warranties.
Installation Complexity: Tight access, rooftop units, or relocating the condenser pad can add $500-$2,000 in labor.

Frequently Asked Questions

How long does a central AC unit last?

What SEER rating should I get?

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