Heating & Air Conditioning Chart (complied from manufacturers’ literature)

Room addition living area	Recommended  total heating rating	Recommended circuit size	Recommended air conditioner rating	Recommended circuit size
100 sq. feet	900 watts	15-amp (240 volts)	5,000 BTU	15-amp (120 volts)
150 sq. feet	1350 watts		6,000 BTU
200 sq. feet	1800 watts		7,000 BTU
300 sq. feet	2700 watts		9,000 BTU
400 sq. feet	3600 watts	20-amp (240 volts)	10,500 BTU
500 sq. feet	4500 watts	30-amp (240 volts)	11,500 BTU	20-amp (120 volts)
800 sq. feet	7200 watts	Two 20-amp	17,000 BTU	15-amp (240 volts
1,000 sq. feet	9000 watts	Two 30-amp	21,000 BTU	20-amp (240 volts)

Electric heating and air-conditioning
for a new room addition will be checked by an inspector. Determine you’re heating and air-conditioning needs by finding the total area of the living space. Choose electric heating units with a combined wattage rating close to the chart recommendation above. Choose an air conditioner with a BTU rating close to the chart recommendation for your room size. NOTE: These recommendations are for homes in moderately cool climates, sometimes referred to as “Zone 4” regions. Cities in Zone 4 include Denver, Chicago, and Boston. In more severe climates, check with your electrical inspector or energy agency to learn how to find heating and air-conditioning needs.

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