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    Let us know how the system performs when you get...

    Let us know how the system performs when you get the Prestige IAQ installed, configured to control both stages properly. I think there will be a difference. CPH for high and low stage heat can be set.
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    Were these temps at the unit or at the registers?...

    Were these temps at the unit or at the registers? Hopefully at the registers. 67 deg supply air is not very good. In fact I'm surprised it's cooling the space within 5-9 minutes even on milder days....
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    Okay. Still likely picking up heat in the attic...

    Okay. Still likely picking up heat in the attic since very few duct systems are fully sealed and well insulated. Next cooling season, you might want to take supply and return temperatures both at the...
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    Not too surprising for an attic system. On very...

    Not too surprising for an attic system. On very hot days, attic temperatures can easily reach 130+ deg. You'll have some capacity loss in the supply ductwork depending on how well its sealed and...
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    Glancing through the installation guide, looks...

    Glancing through the installation guide, looks like there's a heating cycles per hour setting but no cooling cycles per hour setting. Go figure. You might find that the Prestige thermostat with CPH...
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    What kind of thermostat do you have now? Some...

    What kind of thermostat do you have now? Some have a cycles per hour setting that can be adjusted (lowered) to increase average runtimes. 3 is a good setting. Decreasing the airflow a bit can also...
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    There's no one "proper" cfm for a 2 ton system....

    There's no one "proper" cfm for a 2 ton system. Nominally, 2 tons is 800 CFM @ 400 cfm/ton. But some building loads dictate slightly higher or lower airflow depending on the latent and sensible...
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