I would suggest 3plink go online and pursue 'psychometric chart'.
That is the basis for the questions he is asking.
After becoming familiar with the ps chart, 3 plink can find the weather data for his area from NOAA, and design for either worst case conditons, or for nominal summer days.
Getting more fancy, he can look at the MTBF of the transmitter for other than 62F 30RH operation and see how much 12x12 space conditioning is most economical .
That is a standard engineering approach.
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