I do trust you. I'm just trying to understand how the Btu's are different or the humidity dew point is different or what? Do you have very dry days and then very humid days? And if Man 'J' isn't a solution, how do you accurately size a system?
If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!