The only other thing I would add is if you do change ot the system I would reccomend looking closely at the electrical disconnect. If the AC system is that old the disconnect could have weathered badly. It'snot likely but I have seen brand new HVAC systems begin to have trouble because the electrical disconnect being faulty, and costing several trips by AC techs who can't find a faulty electrical system issue. It is something that wouldn't cost very much to check out when the system is upgraded.
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(3)WSMs, 22.5" CharBroil kettle,
4'offset (gave away after 1st WSM cook)
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