I inspected a split-level condo this weekend and it had an AC arrangement I have never seen before.
There was a HVAC suspended in the crawl space and another HVAC unit in the ceiling of the upstairs landing. The problem is there was only one 2.5 ton compressor outside. From inside the crawl space I found where they had put a T in the refrigerant lines to supply both units.
Is this acceptable? I was not able to find data plates on either of the inside units to tell me coil tonnage. In the end I just told them I had never seen this before and that I felt it should be evaluated from top to bottom. It did have some other issues that neede to be addressed.
Does anyone know about this type of set-up?
Thanks,

Depending on what the manufacturer it is? Most standard A/C system you are not allowed to split into a line set as the freon will take the easiest way and one air handler may not get enough and will freeze up. There are several manufacturers that make what is called a mini split with two to four indoor air handler and one condensing unit but with these they all have a seperate line set for each indoor unit.
Most likely the split into the line set was a joe homeowner's handi work.

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Well thats my 2 cents.
Brian Kelly
Kelly Home Inspections