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It should be calculated on the basis of actual area.
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Generally more than 1 square according to the actual calculation, I have been decorating for 12 years to make Feng Aluminum 789 type, double-layer hollow tempered, 300 a square.
If the balcony is closed, you can consider adding a set of radiators, and if it is a temporary emergency, you can use an oil electric heater.
It is best to have a central air conditioner, or two two P, and then a 3P,
square meters = meters, that is, the width of your room is meters. square meters m = m. That is, the width of your balcony is meters.
The integrated ceiling in the kitchen is calculated according to the square, and the artificial material is about 120 square meters, not a brand, and then the panel lamp is about 160!
How high you can, depending on your own preferences, the villa has fallen more than 5 meters to others.