Air Conditioner Size Calculator
Determine the right air conditioner capacity in BTUs for a room based on its square footage.
Recommended BTU
7,000 BTU
Recommended BTU vs Room Area
Formule
## How to Size an Air Conditioner The general rule is 20 BTU per square foot. Adjust for sun exposure and occupancy. ### Formula **Base BTU = Room Sq Ft x 20** **Adjustments**: +600 BTU per person over 2, +10% for sunny rooms, -10% for shaded. 1 ton = 12,000 BTU.
Exemple Résolu
350 sq ft room, average sun, 2 occupants.
- 01Base BTU = 350 x 20 = 7,000
- 02Occupant adjustment = 0 (2 or fewer)
- 03Sun factor = 1.0 (average)
- 04Recommended BTU = 7,000 x 1.0 = 7,000 BTU
- 05In tons = 7,000 / 12,000 = 0.58 tons
Questions Fréquentes
What happens if the AC is too small?
An undersized AC will run constantly, struggle to cool the room, waste energy, and may not reach the desired temperature on hot days.
What happens if the AC is too large?
An oversized AC will cool too quickly without removing humidity, causing a cold and clammy feel. It also cycles on/off frequently, reducing efficiency and lifespan.
Do I need to adjust for kitchen use?
Yes, if the AC cools a kitchen area, add 4,000 BTU to account for heat from cooking appliances.
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