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by tguvot 1195 days ago
>The delta-T that is correctly cited as being "around a max of 20°F" is the delta in temperature across the evaporator (IOW between the return duct and the supply duct [aka the goes-inta and the goes-outta]).

well said. i have temp sensor on supply and return and I graph them and delta, to make sure that hvac works within proper parameters. otherwise during heat waves you start thinking that hvac maybe out of shape