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I'm not really familiar with the different refrigerants other than 12 and 134, and now 1234yf. The experience I have with refrigeration is pretty much limited to automotive / heavy duty (trucks) applications. 422b sounds like it would be a better alternative. The thought process is as follows...

R22 was phased out 1 Jan of 2020 I believe. Or maybe it was 2019. I can't remember, but basically it is now going the way of R12. It's still out there, but they price is really high per pound. I can get 407c alot cheaper and just take the time to convert it.

Here are some pictures I got of the units. He sold one a while back so just has the one. I would have liked to have them both.

So someone near me is selling one of these units. It shows 10kw heat output and 38k BTU cooling. I can likely get it for about $250. Is it worth it? I would use it out here in the west texas heat for events and such so it will get used, but I don't know how good these units are. If it's not...