Well Lads, I now have full kegs in my keezer. I have a Vienna Blonde Ale in the 2.5gal kegs and Ed Wort's Haus Pale Ale in one of my 5-gal kegs. I'll soon have another 5-gal keg filled with Dunkelweizen and I also have an American Wheat ready to brew for the third 5-gal keg.
The Vienna Blonde is ready now and I've knocked down several pints. The Haus Pale Ale will be ready this weekend.
I keep the STC-1000 set at 4.5C. I use a 120mm fan in the coffin and it stays within a couple of degrees of 45F. I use a Coralife aquarium thermometer to monitor the coffin (http://www.amazon.com/dp/B0002DI4TO/?tag=skimlinks_replacement-20). I moved my STC-1000 probe to a 500mL plastic bottle filled with water inside the keezer. I was using a small glass vial that was maybe 15mL. I now use that vial in the coffin to hold the probe for that thermometer. With the thermal mass of the kegs, I like the larger 500mL bottle better for the STC-1000 probe. My compressor only runs about every 2hrs. The downside to that is it runs at least 20min. I moved the temperature differential down to 1-degree from 2 so it kicks on at 5.5C and runs a shorter amount of time. After shutoff, the temp continues to drop all the way down to about 3.4C. Then the slow 2-hr climb back to 5.5C.
With my combo immersion chiller and 40-plate chiller with circulating ice water, I can cool my wort very fast. I also crash cooled it after primary and then kegged it. I think that paid off with a beer that is pretty darn clear.