1x195 3x65 5x59 13x15
In order to get the square footage you need to take 13' times 15' and you will get the square footage
195 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
13ft*15ft = 195 square ft 13 times 15 = 195 as any calculator will tell you (or you can do it in your head - 10 times 15 = 150, 3 times 15 =45 add together = 195)
To convert feet to meters, you can use the conversion factor of 1 foot is approximately 0.3048 meters. So, 13 feet is about 3.9624 meters and 15 feet is about 4.572 meters. Thus, the area of 13x15 feet is roughly 19.53 square meters.
12-ft x 14-ft = 168 square feet = 15.608 square meters (rounded)
15x1=15 15x2=30 15x3=45 15x4=60 15x5=75 15x6=90 15x7=105 15x8=120 15x9=135 15x10=150
That's going to depend on - the beginning temperature in the room, before you light the heater - the relative humidity inside the room - the height of the room, floor to ceiling - the rate of heat loss ('R'-value) of the floor, ceiling, and walls - the temperature outside the room - the means of air circulation in use inside the room. In general, unless the temperature outside the room is 120 or higher, you can never turn off the heater for good.