Raising Air Temp in Living Room: Calculations Needed

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A 1500-W heater is designed to be plugged into a 120-V outlet.

How long does it take to raise the temperature of the air in a good-sized living room (3m x 5m x 8m) by 10.0 degrees C. Note that the specific heat of air is 1006 J/kg and the density of air is 1.20 kg/m^3.

I=12.5 A
R=9.6 ohms

I found I and R but don't know the equation to solve this last part
 
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How much energy does it take to raise the room temperature? You need to answer that question.