I had to use exhaust fans with two AC outside units at our transmitter site, one on each side of the building, to keep the phasor under 120 degrees when the temperature is 90, the sun is beating down and humidity is high. We keep the AC at 65 and it is fine everywhere else in the building. We even tried removing a panel but the RF was a bit scary in the room so we opted for the exhaust fan dedicated to the phasor. You make a great point David about tropical storms, etc. We haven't had one yet with the new site.