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.
The Emerson microwave model MT3070A typically has a power output of 700 watts.
Answer = 20 ft x 34 ft = 680 sq ft
Use this conversion: mph x 1.466 = feet per second
108.2677165 ft Direct Conversion Formula 33 m* 1 ft 0.3048 m = 108.2677165 ft
If you tell us the starting temperature and the finishing temperature and the specific heat of the material this 200 sq ft is made of then we'd have a chance of answering this one. But let's say that you're talking about a room (you didn't say you were but let's assume this), then a rule of thumb calculation, where the assumption is made that it takes 10 watts to heat a square foot of room, would show that you'd need 2,000 watts.
A turn key house can cost anywhere from $80 per square ft to $200 per square 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 per sq ft to paint the interior of a house
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
1 ton per 500 sq ft. so 5 will do
I paid $9 ft on a guest house that has 900sq ft...live in TX
On average it takes 1 ton per 500 square ft.
160 per sq ft
cost to build per sq. ft. in Duncan, b.c.
1400
27-ft x 38-ft = 1,026 square feet of floor per story.