Right, one question I see sometimes, and it's about the lower 'BTU' ratings, that I thought would be good to answer in here.

For instance, you have a 850BTU low temp compressor.

That's not much is it? Or is it?

Generally compressors are rated to what they do. So having one that's rated to Ashrae or Cocemaf whatever will read a lot lower than one rated to higher temps.

So, if you have 850BTU at -25 (Cecomaf) for instance as your rating, then you have around 250w of heat removal at -25.

That would put it at the approximately 1/3HP range for a compressor.

So it's a good idea to look at the spec sheet of the compressor you're looking at, and check what the heat removal is at the temperature that you'd actually be using it at.

Then the HP rating and all that starts to make more sense, because the rating of a compressor and what it actually translates into for YOU can look a lot different when you look deeper into the real spec of the compressors.

Cheers

Gray