i am trying to find the total kw usage of a 10 ton rooftop unit. Its model # is TCD120C40AAB. Its EER value is 9.2. Nominal CFM is 4000. Gross Cooling Capacity is 125,000. System Power is 12.83 kw. I am trying to figure out how much kw i will be saving by getting a "cool roof" instead of a typical black roof. The white roof will have R-20 insulation as the black roof only had R-6. When i look at the Product Gross Cooling Capacity Performance Data Sheet, i can search what the MBH is going to be at different ambient temperatures. This way i can see what the kw usage is at 165 degree Fahrenheit and the kw usage at 115 degree Fahrenheit and determine how much i would save by implementing a white roof. I just cannot figure out how to calculate the kw usage of my unit at different temperatures as a projection. PLEASE HELPP!!!!