What size AC do I need?

Roughly 1 ton per 500–700 sq ft, but a Manual J load calc is the only reliable answer.

HVAC · Entity

Central Air Conditioner

A split-system cooling unit with an outdoor condenser and indoor evaporator coil that distributes cooled air through ductwork.

Quick answer

Central Air Conditioner: A split-system cooling unit with an outdoor condenser and indoor evaporator coil that distributes cooled air through ductwork. Typical cost: $4,500–$9,500 installed for a 3-ton 14–16 SEER2 system..

Why it matters

Central AC is the default cooling system in most US homes; right-sizing and SEER2 rating drive both comfort and your summer power bill.

Typical cost

$4,500–$9,500 installed for a 3-ton 14–16 SEER2 system.

Pros

• Whole-house cooling
• Quiet vs window units
• Pairs with existing furnace ducts

Cons

• Needs ductwork
• 10–15 year lifespan
• Refrigerant transitions (R-410A → R-454B) raise replacement costs

Common uses

• Existing forced-air homes
• Hot and humid climate zones

Alternatives

Heat pumpMini-splitsWindow/portable units

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Frequently asked questions

What size AC do I need?: Roughly 1 ton per 500–700 sq ft, but a Manual J load calc is the only reliable answer.

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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.