How to Convert a 12,000 BTU AC to a 10,000 BTU

Air conditioners have ratings to determine the optimum amount of cooling they provide. The British Thermal Unit (BTU) is a standard unit for energy. It is the equivalent of 1055 joules. It is the amount of energy required to heat one pound of water from 39 degrees Fahrenheit to 40 degrees Fahrenheit. The BTU ratings for air-handling systems are actually a shorthand for BTU per hour (BTU/hr). A 12,000 BTU system is optimized for controlling the temperatures in a space between 450 sq. ft. and 550 sq. ft. Smaller spaces require less energy. A 10,000 BTU air conditioner is optimized for 400 sq. ft. to 450 sq. ft. The easiest way to conform to this change is to replace the entire air-conditioning system. However, modifying and replacing components is a possible alternative.

Things You'll Need

• Compressor
• Condenser
• Evaporator
• Expansion valve

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Instructions

1. • 1

     Replace the compressor with a 10,000 BTU compressor. Use a variable-speed model if possible. Remain aware of component ratings, as compressors should never have a higher rating than the other components in the system.

   • 2

     Replace the air conditioner's condenser. Beyond forcing the fluid into a liquid state, this external coil serves a limited cooling function. Use a condenser with an appropriate rating.

   • 3

     Remove the air conditioner's evaporator. Replace this internal coil with a different-size component with an appropriate rating.

   • 4

     Replace the expansion valve. This component is used in tandem with the compressor and forces the fluid between liquid and gaseous states. Use a thermostatic expansion valve to adjust for component sizes.