PDT,

Really sorry that the new setup did not work for you. Exactly what pump are you using? Does it have a pressure switch? Is this a submersible pump or inline? The spray output should be the same temp as your rez, there should be no additional heat produced by your pump.

Aero systems that use an accumulator tank or a pressurized tank (like a small well tank) use the pump to fill it and the pressure cut-off switch to determine the pressure of the tank/system.

Here's a link to AI (aeroponics international), these where the first people to offer a commercially available aeroponic systems. There is plenty of info there and they do sell parts such as mister nozzles and pumps (tho expensive).
Aeroponics, aeroponic systems and biocontrols to grow pesticide-free aeroponic food anywhere

We need to get you over this hurdle. You got some good answers about not needing all that hydrotron in your net pots on your other thread. One of the main advantages to using aero/fog is doing away with a grow medium.