AC Size Calculator
Find the right air conditioner tonnage for your home. Enter your home details below for a free estimate.
Enter Your Home Details
How AC Sizing Works
Air conditioner size is measured in tons — 1 ton equals 12,000 BTU/hour of cooling capacity. In Western North Carolina (climate zone 4), most homes need about 25 BTU per square foot. This calculator adjusts that base figure for ceiling height, insulation quality, and sun exposure.
Why Correct Sizing Matters
An undersized AC runs constantly and struggles on the hottest days. An oversized AC short-cycles — it cools quickly, shuts off, then turns back on, wasting energy and leaving your home humid. Proper sizing means lower energy bills, better comfort, and longer equipment life.
Common AC Sizes for WNC Homes
| Home Size | AC Size (Tons) | BTU |
|---|---|---|
| 1,000 sq ft | 1.5–2 tons | 18,000–24,000 |
| 1,500 sq ft | 2–2.5 tons | 24,000–30,000 |
| 2,000 sq ft | 3–3.5 tons | 36,000–42,000 |
| 2,500 sq ft | 3.5–4 tons | 42,000–48,000 |
| 3,000+ sq ft | 4–5 tons | 48,000–60,000 |
More Free HVAC Tools
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