In more detail
1 watt is about 3.412 BTU/h, and one "ton" of cooling is 12,000 BTU/h. A rough guide for room air conditioners is about 20 BTU per square foot, adjusted for sun, ceilings and people.
Glossary
Science & Engineering
BTU
A BTU (British thermal unit) is a unit of heat energy; BTU per hour measures the heating or cooling power of equipment.
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See also
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Glossary
R-value
R-value measures a material's resistance to heat flow; a higher R-value means better insulation.
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Glossary
Kilowatt-hour (kWh)
A kilowatt-hour is the energy used by a 1,000-watt device running for one hour, the unit on electricity bills.