BTU and cooling capacity calculator
Estimate cooling capacity from your room volume, a thermal assumption and sun exposure.
Your estimate
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Sources and methodology
Educational model: area × height × 30/40/50 W/m³ × sunlight factor. Sensitivity range ±20%, not a confidence interval. 1 kW ≈ 3,412 BTU/h. This is not a professional heat-load assessment.
FREATH ONE 12,000 / 14,000 BTU depending on the room
Your questions, answered
How many kW is 12,000 BTU/h?
Approximately 3.52 kW of cooling capacity: divide 12,000 by 3,412. Electrical input is a separate figure.
Does the calculator guarantee correct sizing?
No. It gives a transparent initial estimate. Attic rooms, large glazed areas and high heat loads need a more detailed assessment.
How many kW is 9,000 BTU/h?
Approximately 2.64 kW of cooling capacity: divide 9,000 by 3,412. This unit conversion does not tell you electrical consumption or guarantee cooling for a particular floor area.
Should I buy the most powerful air conditioner?
Match capacity to the room’s heat load. A larger unit may take up more space, and its controls also affect operation. Assess sunlight, ceiling height and heat exhaust before comparing individual models.
How much does one night of air conditioning cost in CHF?
An example, not a universal Swiss tariff: an average electrical draw of 1 kW for 8 hours at CHF 0.30/kWh costs CHF 2.40. At an average 0.5 kW it would cost CHF 1.20. Use your own tariff and measured consumption, rather than cooling capacity.
Does the advertised floor area apply to an attic room?
Not automatically. A hot roof, glazing and ceiling height can increase the load substantially. Advertised coverage is a guide. Have the heat load checked before buying for a heavily exposed room.