Question 1

What is a BTU?

Accepted Answer

BTU (British Thermal Unit) is a unit of measurement for heating and cooling capacity. One BTU is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit. Higher BTU ratings mean greater heating or cooling power. Home air conditioners typically range from 5,000 to 36,000 BTU.

Question 2

How do I calculate how many BTU I need for my room?

Accepted Answer

The basic formula is: room area (sq ft) x 20-25 BTU per square foot. Then adjust for insulation quality, ceiling height, sun exposure, number of occupants, and whether the room is a kitchen. Generally, add 400 BTU per additional person for cooling, and add 4,000 BTU if the room is a kitchen.

Question 3

How do I convert BTU to tons or watts?

Accepted Answer

1 ton of cooling equals 12,000 BTU/hr. 1 watt equals approximately 3.412 BTU/hr. For horsepower (HP), 1 HP is roughly 9,000 BTU/hr. For example, a 12,000 BTU air conditioner is 1 ton, about 3,517 watts, and roughly 1.3 HP.

Question 4

What factors affect BTU requirements?

Accepted Answer

Key factors include: room size (square footage), insulation quality (good/average/poor affects the base BTU multiplier), ceiling height (above 8 ft needs more), sun exposure (south-facing or heavy sun needs more, shaded needs less), number of occupants (each person adds ~400 BTU for cooling), kitchen (add 4,000 BTU), and whether the room is on the second floor.

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