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How to Choose the Right AC Size (BTU) for Your Toronto Home — Sizing Guide
Rule of thumb: A common simplification is ~18–22 BTU per sq ft for Toronto homes. However, a proper Manual J load calculation accounts for insulation, ceiling height, windows, orientation, and local climate.
Why Proper Sizing Matters
- Undersized AC — Runs continuously, can’t cool the home on hot days. High hydro bills.
- Oversized AC — Short-cycles (cools too fast, shuts off), doesn’t remove humidity, noisy, wears out faster.
- Correctly sized — Runs efficient full cycles, removes humidity, extends equipment life.
Common AC Tonnage for Toronto Homes
- 800–1,200 sq ft condo/bungalow — 1.5–2 ton
- 1,200–1,800 sq ft semi — 2–2.5 ton
- 1,800–2,400 sq ft detached — 2.5–3 ton
- 2,400–3,200 sq ft — 3–4 ton
What size air conditioner do I need for my Toronto home?
Rough sizing for Toronto homes: 1.5-2 ton for 800-1,200 sq ft, 2-2.5 ton for 1,200-1,800 sq ft, 2.5-3 ton for 1,800-2,400 sq ft. A proper Manual J calculation is required for accurate sizing. Never size by rule of thumb alone. Madina Mechanical performs Manual J calculations for all new AC installations. Call (416) 424-4328.
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