Egh, you are failing to look past the specific example I gave *facepalm* Let me try to be a bit more clear.

I specifically mentioned the 1/8hp compressor illustrate the point that amount of heat moved isn't just a function of compressor size but pressure ratios and gas choice factor in also. I'll meet you halfway and agree that the PDFs are more ideal than our cramped systems can achieve, but you can definitely get very close with a well engineered system.