Yep, and with inexpensive snap switches, redundancy is easy, either two of the same in parallel on the same circuit, or with computer fans, you can have them come on in stages... Most snap switches are designed for switching AC current. But again with computer fans, you switch the AC feeding small DC supplies powering the fans, and you use the AC already provided by the generator, no need for a separate alternator...
As for runnig temp, diesels like being run hot. It aids in fuel atomization/more complete combustion and the engine runs more efficiently. I would reccomend a 190F - 195F thermostat.