What does MBh mean in air conditioning terms?

MBh stands for One Thousand BTU per hour. BTU stands for British Thermal Unit. MBh units should help with the cost estimate of running your air conditioning (AC). It's a measure of the heating/cooling capacity of AC equipment.

MBH - One MBH is equivalent to 1,000 BTU's per hour. The 'M' is derived from the Roman Numeral M that equals 1000. Such as MMIX = 2009.

(This M is often confused with the SI (Système International) 'M' which stands for the prefix Mega, equal to One Million (1,000,000). Note BTUs and therefore MBH are Imperial Units.)

BTU - A standard unit of measurement used to denote both the amount of heat energy in fuels and the ability of appliances and air conditioning systems to produce heating or cooling. It is is the amount of heat required to increase the temperature of a pint of water by one degree Fahrenheit. BTUs are measurements of energy consumption, and can be converted directly to kilowatt-hours (3412 BTUs = 1 kWh) or joules (1 BTU = 1,055.06 joules). A wooden match produce approximately 1 BTU.