I am not that smart when it comes to math. But I was wondering if there is a formula calculator or something online that would help me with the example of a problem. For instance if the attic is 130 degrees and I have a 14 inch round metal duct to my air conditioner in the Attic is there a way to calculate how long the insulation will prevent heat from getting into the duct? Say my duct has 50 degree air in it, and the attic is 130 degrees is there a way to calculate the resistance and time to temperature change of using say r19 insulation around the pipe? This is not just for this I have been wondering if I added a smaller second water heater in series and created a small room under my house and super insulated it how long would it hold the temperature in the tank? Does this make sense?