I知 looking to construct my own refrig system using r404. I want to be able to change the temperature of the evap coil. I知 looking to to vary between-30c and -50c. I知 prob going to use a compressor between 1/3 and 2/3 hp.

Is there something on the market that exists? Does it have to be packless? I could use a cap tube, but it would be a lot of guess work as I壇 like to use salvaged parts.

Thanks!

1001yos