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Hi Andy.
A few members have done peltier cooling units - not for DSI's, but for mirrors.
Anthony (Bird) has his all computer controlled. The first step is to monitor and log the temperature so you know what it's doing. Bird built his own temperature logger that feeds into his laptop. He then built the peltier units to switch on and off controlled by his software program which will turn on or off at the desired temperature.
David Pretorius has a manual temperature sensor (indoor/outdoor dick smith unit), and a manual peltier unit, turned on and off by hand. again, cooling the mirror.
I believe wombat_in_space has made a computer controlled unit similar to Bird, but I don't have any details.
Hopefully those guys will fill in the blanks. Dave got the peltier and fan units from a dick smith travel fridge.
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