My son bought a small house (around 1100 sq ft.) last fall and had everything checked out by a inspector that was recommended by his lender. Everything checked out fine. Since it's started getting warmer, the air conditioner has been running and seems to run a long time before shutting off. How can I tell what tonnage the unit is? The serial # is WFMM086607
Also, one of the plaques near the evaporator core has both r-12 and 134 listed as usable. How can we tell which one is being used?
Would just like to have this info before he calls a tech.