This loks like a serial # made in 10-07-89 now you need the model # to tell what size. The model # usually has letters followed by the multication # of 12. Which =-1-ton like ""gud36a-1" in which 36 = 3 tons of cooling this is on the outside unit Now what if it says "dar42a-1..... this is a 3 1/2 ton of cooling in major cases...
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This loks like a serial # made in 10-07-89 now you need the model # to tell what size. The model # usually has letters followed by the multication # of 12. Which =-1-ton like ""gud36a-1" in which 36 = 3 tons of cooling this is on the outside unit Now what if it says "dar42a-1..... this is a 3 1/2 ton of cooling in major cases...