Need to install new oil furnace 
75000 to 85000 btu Or British thermal pound.
Two units of measure are important in sizing an oil furnace. The first is the British Thermal Unit or BTU, which represents the energy needed to raise the temperature of one pound of water by one degree Fahrenheit at normal atmospheric pressure. The input capacity of an oil furnace is often stated using this unit of measure. The second number is the fuel efficiency rating, which is expressed as a percentage. This represents the amount of energy that gets converted to heat, with higher numbers being better. To determine the energy output in BTUs per hour, multiply the input BTU by the efficiency rating. For example, a furnace with 100,000 BTU of input and an efficiency rating of 89 produces 89,000 BTUs of output. One with an efficiency rating of 80 and the same input amount, produces only 80,000 BTUs of output.
Read more: http://www.ehow.com/info_12197488_size-oil-furnace-required-1200-square-foot-house.html#ixzz2jfsuqLFx
SOURCE: i would like to install central air to my magic
Hi manny factors are involved but a 3 ton system with at least a 1/2 hp blower (in high speed) should get the job done...
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Actually.the size of the furnace needed can vary if it's an older house, with poor insulation or windows. I would not install less than a 100 thousand BTU input if this is the case. don-ohio
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