In the last few years I have installed four 12000 btu Mr Cool units and one of the 27000 btu units with two 12000 btu air handlers. I am happy with the performance of all of them, but if I had it to do over again, I would install two of the 12000 btu units instead of the 27000 btu unit. The price would be approximately the same, but the smaller units are much easier to deal with. The fact that the 12000 btu units require only 120 v power means that you can often make use of existing wiring rather than run a new line. The 27000 unit is quite heavy. It is much more difficult to move around . I didn't realize that fluid is pumped to both units even if only one of them is turned on. This results in confusing readings on the app and it probably results in reduced efficiency. I many cases using two smaller units rather than a large one would allow use of shorter lines. I appreciate that fact that HOD makes it easy to order units with appropriate line lengths rather than being forced to use standard sizes that may be longer than necessary.