Central air systems are sold and installed through dealers. The two Amazon outdoor units named here were checked on October 22, 2026, and cost only the outdoor box. Ratings and prices are below. Check all details with a licensed installer.
A central air conditioner cools the whole house through ducts. It is also the biggest cooling purchase most people make. The old page covered brands, parts, types, cost and what to ask. Here is the short, honest version.
Table of Contents
Split or Packaged?
A split system has an outdoor condenser and an indoor coil, usually over a furnace or air handler. A packaged system puts everything in one outdoor box, common for homes without a basement. Split systems are the usual choice. Your house and ducts decide it.
How It Works
Refrigerant picks up heat inside at the evaporator coil, then dumps it outside at the condenser. The blower pushes cooled air through the ducts. The compressor does the heavy work, and it is the part to protect.
SEER2 and Climate
SEER2 is the efficiency score used on new systems. In hot, humid regions, a higher SEER2 saves real money. In mild climates, the payback is slow. Our SEER2 energy savings guide explains the math.
Here is where central AC is heading: heat pumps in place of plain AC, new refrigerants and higher efficiency floors. Dealers now quote SEER2 and quietly favor variable-speed equipment. A 3 ton Goodman outdoor unit lists at $1,992.00 and a 3 ton Rheem at $2,184.00 for the box alone, before ducts or labor.
Two Outdoor Units on Amazon
Both are outdoor condensers only. You still need an indoor coil, line set, labor and permits.
Price on Amazon: $1,992.00 | 4.5 stars from 3 ratings (checked October 22, 2026)
The Goodman GLXS3BN3610 is a 3 ton, 13.4 SEER R-32 outdoor unit. It costs $1,992.00, rated 4.5 (3).
Price on Amazon: $2,184.00 | stars from ratings (checked October 22, 2026)
The Rheem / Ruud 3 ton 16 SEER outdoor unit costs $2,184.00 and has no ratings yet.
Sizing
Rough rule: one ton per 500 to 600 square feet. A Manual J load calculation is the right way. A quote with no measuring is a warning sign.
Thermostats and Controls
A smart thermostat can cut run time by scheduling, but it cannot fix a leaky duct. A two-stage or variable-speed unit pairs best with one that supports staging.
Warranty
Parts warranties often run five to ten years if the unit is registered. Labor is separate. Ask who registers it, and when the deadline is.
Common Problems
Dirty coils, bad capacitors, low refrigerant and frozen lines top the list. Before a service call, read central air conditioner not cooling.
Picking a Contractor
Ask for a license number, insurance and local references. Ask who does the install, not just who sells. A written load calculation and a commissioning checklist beat a brand badge.
Brand Reviews
Read the Goodman GSX16 review and the Amana ASXC18 review for two common choices.
The downside is price creep and service risk. New refrigerants are mildly flammable and need trained techs, parts for older systems get scarcer and a quote can run well past the unit price. The Goodman listing has 3 ratings and the Rheem has none, so the web will not tell you much. Expect big gaps between quotes and a lot of upselling.
FAQ
How much does a central AC cost?
The outdoor box alone lists from $1,992.00 here. Full replacement costs several times more once the indoor coil, labor and ducts are in.
What size central AC is needed?
Roughly one ton per 500 to 600 square feet, but a load calculation gives the real answer.
Is a heat pump better than a plain AC?
In many climates, yes, since it heats too.
Can you buy a central AC on Amazon?
Outdoor units are listed, but installation needs a licensed pro.
Final Word
Get three quotes, ask for the SEER2 in writing and pick the installer first and the brand second.
What comes next: more rebates for heat pumps, tighter rules and smarter thermostats that talk to the grid. Get three written quotes, ask for the SEER2 number and compare the install, not just the box.
Related Guides
Keep going with what a central air conditioner is, central air conditioner not cooling, Goodman GSX16 review, Amana ASXC18 review and SEER2 energy savings guide.
