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He should be considering what the actual insulating value of the walls and ceiling space is going to be.
Most manufacturers have a system calculator that takes this into consideration as well as window size/type and insulating values and ventilation requirements/infiltration.
A new home with tight construction and great insulation is much easier to cool and keep cool. Curtain and blinds can also make a huge difference in the required tonnage.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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