Thinking about Peltier coolers that i have worked with, a few things come to mind.
- They've have always been 4A + whatever the fan requires.
- of the top of my head the maximum temperature change is 18 degrees Celsius.
Don't pin me down on these things though.
With super slow PWM (.05Hz a 20second cycle) i think you can come to a very decent prediction of what might happen, though i suggest to just leave the Fan running.
The delay in temperature change is going to depend a lot on the object the is being cooled/heated, so i think that a percentage controlled system is definitely worth a go,
First of all, why did you start a new thread ? and why didn't you leave a link to the new one in the old one ? I don't think it's very cool really.
I mentioned the 'very slow PWM' which i still think is the way to go,.
F provide it with a lower voltage, the current will drop and the heat exchange will be less, but for that you need a variable power supply, or device that can increase resistance, like a transistor.
But i do really want an answer to the first question.