Air Conditioner Calculatorr can estimate the amount of BTUs you will need to heat or cool your home, based on the size and the temperature you want for your home.
Please note that this calculator can only gauge a rough estimate. You should also consider factors like efficiency decrease of the heater or air conditioner with time, the shape/type of your home or room, insulation conditions, and other factors. 1 watt is approximately 3.41214 BTU/h.
Air Conditioner Calculator(US)