IOT Automation Control of Humidity and Temperature

Hello,

I am currently working on a IOT project where I need to control the Temperature of air that is transported into a space through a Pump or alternativly heat the place after the Air is transported.
Are there any non costly good and efficient options?
I need to do the same with Water , are there any already pre design solutions or modules for this?
Fuhrter more that solution should be as small as possible.
Or is the best way todo that to somehow just use a spool and wrap a heating wire around that? and if that is the best Option. What are the best Sources to read more on how to construct that?

Thanks in advance.

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