4.5-Ton Central Air Conditioners: What to Buy

The two sizes to choose between

• 

  If the load calculation says 4 tons or a little more

  Goodman GLXS4BA4810

  Outdoor unit only. Rated 13.8 to 15.2 SEER2 (AHRI). The pick on the 4-ton page.

  $2,785 on Amazon
• 

  If it says closer to 5 tons

  Goodman GLXS4BA6010

  Outdoor unit only. Rated 13.8 to 15.2 SEER2 (AHRI). The pick on the 5-ton page.

  $2,971.34 on Amazon

What it costs

Amazon prices read today. Installed prices are U.S. typical for a replacement on existing ductwork, equipment, labor and permit together, from EnergySage, Modernize and other published 2026 data (compiled July 2026).

Before you buy

1. Get the load calculation. It decides 4, 4.5 or 5 tons for your house. When you replace a 4.5-ton unit, ask the installer which way to go.
2. Book the installer first. Goodman gives no warranty on equipment bought online unless a licensed dealer installs it to code.
3. Check your region. At this size the federal floor is 13.4 SEER2 in the North and 13.8 SEER2 in the Southeast and Southwest.

Questions buyers ask

How many square feet does a 4.5 ton AC cool?

About 1,800 to 2,250 sq ft by the common rule of one ton per 400 to 500 sq ft. The U.S. Department of Energy warns that rule ignores your climate and insulation, and recommends a contractor's load calculation (Manual J).

How much does a 4.5 ton AC cost?

Installed by a contractor, typically $6,250 to $12,500, equipment and labor together. We found no 4.5-ton Goodman on Amazon; the 4-ton is $2,785 and the 5-ton $2,971.34.

Should I go with 4 tons or 5?

Let the load calculation decide. A unit that is too big cools the house before it dries the air, so it can feel damp; one that is too small runs nonstop on the hottest days.