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btus needed to heat & cool 625sf room
to calulate your btu needs,you can use this link: http://hearth.com/calc/btucalc.html
about 12,000
Standard practice holds that it takes 5000 BTUs to heat a room 100 to 150 sq ft Figure on adding another 1000 BTUs for every 50 or so sq ft added. Hence , 400 to 450 sq ft would need about 10,000 BTUs
80,000 btus (british thermal units) should heat up 3,500 square feet