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my name is ***** ***** unit size did not come through
Ok got it that time...no a 2.5 inside will not work with a 3 ton outside.
You can go half size bigger inside..but not out.
Look at the outdoor unit as a bucket of water with 3 gallons....and the indoor a 2.5 gallon bucket.....it will not fit...but if the indoor was 3 or 3.5 it would fit...you just cant have the indoor smaller
sorry...yes....a half ton bigger inside is preferred for efficiency
You will still want the 2.5 flowrater, piston or txv though