Here's a specific example:
I use an SBIG ST-8300M. Here in Central Texas our current nighttime temperatures are in the mid-80's F (about 30 C). My ST-8300M will do about 30 C down from ambient so I am currently setting the SGP temp control box to +5 C, the lowest temperature at which the camera reliably maintains regulation.
I personally don't set the cool down temperature in the equipment profile, I prefer to set it in the pull down temperature box from the toolbar since my requirements (or possibilities) will vary with the weather.
You might want to check out "Camera Temperature Control (TEC)" in the SGP help file.
Clear Skies (and lower temperatures :>)