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Hello FvM, thanks for clarifying. I have some follow up questions.

1) To clarify your remark about peltiers having 'mostly resistive characteristic', you're saying that I just need to change the dissipation rate of energy to control the temperature, which can be done through either voltage/current modulation right?

2) When you say that a switching converter is more efficient, you're saying that's more efficient compared to something more basic like a voltage divider, right?

3) For polarity switching, I did some digging previously, and was told that an H-Bridge was one way to achieve this. For my particular application, would you use this method or are there other ways of polarity switching that would be more appropriate?

Sorry if I'm asking too many questions. Building a project like this is simultaneously intimidating but also exciting.