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.
To light up a 1500 sq ft house, you typically need about 100 to 150 watts per 100 sq ft, depending on the desired brightness and the type of lighting used. This translates to approximately 1,500 to 2,250 watts for the entire space. However, using energy-efficient LED bulbs can significantly reduce this wattage requirement while still providing adequate illumination. Ultimately, the specific lighting design and personal preferences will influence the exact wattage needed.
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
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
cost to build per sq. ft. in Duncan, b.c.
1400