10 ft x 20 ft room = 200 square feet
It will take 300000 btus at 12000 a ton and a ton of air will be 400 sq feet so. 10000 sq ft divided by 400 is 25 tons of air then multiply 25 times 12000 btus and you get 300000
200 yd = 600 ft
According to the Energy Star chart, 12,000 BTUs will cool a room of 450 up to 550 square feet. I'd stay on the low end of that.
200 ft * 900 ft = 4.13 acres (to 2 dp).
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
10 ft x 20 ft room = 200 square feet
12,000
assuming those numbers are in feet: 10 ft * 20 ft = 200 sq. ft.
16ft x 12½ft for example
It will vary on the room type and construction. However you can assume you want 10-15 watts of energy per square ft. That would mean you want 2500-3750 watts total, which would be 8,500 - 12,750 BTU's (3.4 BTUs/Watt).References:How_many_square_feet_does_a_5000_BTU_heater_heathttp://www.diychatroom.com/f18/btus-watts-35066/
up to 500 sq.ft.
80000
200 sq ft
The number of BTUs needed to cool a room depends on factors such as insulation, ceiling height, and climate. On average, a 300 sq ft room would require around 6,000-7,000 BTUs to keep it under 90 degrees Fahrenheit in moderate climates. It's best to consult a HVAC professional to determine the exact BTU capacity needed for your specific room.
200 ft * 200 ft = 40000 sq ft = 0.92 acres (approx)
The number of BTUs in a 6 ft baseboard heater would depend on the model and specifications of the heater. On average, a 6 ft baseboard heater can generate around 1,000-1,500 BTUs per linear foot, so a 6 ft baseboard heater may produce approximately 6,000-9,000 BTUs.