Here is how I did it.
Step 1: The Controller.
For cooling purposes the left display must be set high at the cutoff temperature and the right display must be set low at the start temperature.
Adjustment is super easy with the pushbutton switches for each display.
I think this is the very best temperature controller on the market for hobby projects.
The one I ordered from Amazon.com can be used from 20v up to 30vdc.
Step 2: The New Fan.
Step 3: Installing Into the Cabinet.
The 24v supply I got right on the lid from my wind turbine setup.
The thermal sensor was placed high enough onto the lid to sample the internal temperature. I was careful not to place it near the fan to prevent fast cooling of the sensor.
Step 4: Testing!
Step 5: Completion!
I'm happy with the installation and this is yet another important item off the checklist!
I hope fellow hobbyists have found this instructable interesting.