Monolythic unit Is just for dedication but it can be used with less efficiency. I can build it with copper tubing but it’s not easy and best option. I don’t want to reinvent the wheel so please keep in mind that it’s my choice to use reversed climatization or regular refrigarator loop with some automobile parts (:
If I put hairdrier in a refrigerator or climatized car some parts in a loop will get hot. That’s it.