Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit

Mini split output

Does anybody else feel like the actual output of mini split units is less than the rating, or the output of a conventional AC is higher than the rating? No matter how many times I dig into it, the result is always the same: a 2 ton conventional will always cool better than a 2 ton mini split in the same space. Is there a way to measure actual output? For example, I put a 3 ton Panasonic split HP in my 40x40x14 shop with a 19k cooling and 31k heating load, and the cooling SUCKS. It can run 24/7 and will never pull indoor temp more than 20 degrees below outdoor temp but 15 is more realistic when it's hot. The charge is correct, lines are insulated, it seems to be working properly just doesn't cool well. In comparison, my house has a 29k calculated cooling load and the 2 ton conventional (I installed it when I was 19 and didn't know how to size equipment) will keep it 67 degrees even when it's 105 outside. This just doesn't make sense to me.


  • Matt_67Matt_67 Member Posts: 179
    It seems to me the mini splits have less sensible capacity then conventional a/c units. We did some industrial cooling where we pulled out 4 three ton Mitsubishi p series units and installed 2 five ton conventional systems with low ambient cooling. The original setup wasn’t keeping up but with the new equipment the second five ton unit cycles. We struggled to keep the evaporators on the p series units clean so that probably was a factor as well. But if you look at the mini split air flow they are almost always below the standard 400 CFM per ton. I wonder if air recirculation is a factor as well.
  • GroundUpGroundUp Member Posts: 995
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,099
    Mini splits don't have the air circulation capacity,

    There like window ACs the cabinet is small do they use less air flow and cool a smaller volume of air at a greater TD
Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!