I wanted to post our experience with head pressure and electric costs. We have two Fricks 300hp and one Frick 150hp screws. The tower has three 15hp fans. We lowered the head pressure from 150psi to 120psi. Our savings each month during the summer months were about $5000 USD and the spring/fall months were about $3000 USD. The two 300hp Fricks operate most of the time and tower does have scale build-up.

Hope this helps any curosity...