There is no requirement as such. Watts is a use of power. For example, Al Gore uses more power per square foot then most of us do. A well run home will use about 500 KWH's of power in a month (on average). A poorly managed home may well run ten times this amount.
Size only changes the heating and air handling costs. If a home uses gas heating the overall cost will also go way down.
700W, .7 cubic ft
While Amps and Volts are both units of electrity, they are quite independant. Total electrical energy is measured in "watts". Amps * Volts = Watts. You can get 100 Watts with 10 Volts @ 10 Amps. You can get 100 Watts with 100 Volts @ 1 Amp. You can get 100 Watts with 1,000 Volts at 0.1 Amp. It's like asking, "How do you get water flow of 20 gallons per minute?" You COULD have a 3 ft diameter pipe with very low pressure, or you COULD have a 1/2 inch pipe with very HIGH pressure. Both could give you the desired 20 gallons per minute.
22 ft
Answer = 20 ft x 34 ft = 680 sq ft
108.2677165 ft Direct Conversion Formula 33 m* 1 ft 0.3048 m = 108.2677165 ft
A turn key house can cost anywhere from $80 per square ft to $200 per square ft
cost per sq ft to paint the interior of a house
700W, .7 cubic ft
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/
$100 to $150 per sq ft
I paid $9 ft on a guest house that has 900sq ft...live in TX
1 ton per 500 sq ft. so 5 will do
On average it takes 1 ton per 500 square ft.
160 per sq ft
40 watts/sq ft for 1700 sq ft = 68,000 watts or 68 kw. If you are going to keep this on 24/7, then the number of hours is 31 x 24 =744 (I have assumed 31 days in the month), so the usage is simply 68 x 744 = 50592 kwh
cost to build per sq. ft. in Duncan, b.c.
1400