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Absolutely Dunk, the TEC is the priority and the major factor in the success of the build and operation. My point with fans is that many of the good fans now run at speeds from 1500 up to 3000rpm and while that maybe wonderful for dispersing the heat of hot summer night, it is way over requirement for a cool winter's night when maybe 400rpm would be sufficient for the TEC. I have always run my fan at 100% by directly connecting it to 12V and never had a problem, but in winter when ambient is below 12C you don't need much fan push to keep the TEC working effectively down to your target. Especially if your only looking to stay above 0C, you don't need alot of air pressure. If your looking to run down below 0C then yes you need more flow for heat disappation (when talking about fans and heatsinks of equal size). If your objective is to stay above 0C then buy a smaller fan/heatsink combo that just has the pull down you need, but keep in mind that overshoot and undershoot around the setpoint will get larger the less capable your heatsink/fan at responding. No one needs a fan control circuit, you can get along just fine without it if you have nailed the selection of the heatsink and fan for your particular use; it just gives you some flexibility to use larger combo configurations at reduced settings.
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