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Convert BTU to watts, kWh, and calories. Calculate the BTU needed to cool or heat a room.
Room Cooling Estimate
BTU Conversion Factors:
1 BTU = 0.29307 W = 0.000293071 kWh = 252 cal
Room Cooling (estimate):
BTU/hr = Room Volume x 2.5 (rule of thumb at 8 ft ceiling)
The room cooling estimate is a general guideline. Actual requirements depend on insulation, sun exposure, climate, occupancy, and appliances.
A British Thermal Unit (BTU) is the amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit. It is commonly used for heating and cooling equipment ratings.
A rough estimate is 20 BTU per square foot for an 8-foot ceiling. A 200 sq ft room needs approximately 4,000 BTU. Adjust for high ceilings, direct sun, or poor insulation.
BTU is a unit of energy. BTU/hr is the rate of energy transfer (power). Air conditioners are rated in BTU/hr capacity.
12,000 BTU/hr (1 ton of cooling) = 3,517 watts. A 12,000 BTU window unit uses about 1.2 kW of electricity.
1 ton of cooling = 12,000 BTU/hr. The term comes from the heat absorbed by melting 1 ton of ice in 24 hours.