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Typically you should see temperatures around 60 degrees coming out of your registers, depending on the temperature in the house at the time.
Your mechanic likely checked this but if you want to see if your system is running properly you need to drill a small hole in your ductwork before and after your evaporator coil. Insert a probe style thermometer and measure the temperatures there.
What you want is a temperature difference of 15 to 20 degrees. Less than that and your system is either low on refrigerant, has a dirty air filter or dirty or plugged condenser.
Maybe Brian can chime in on this as well.
Also when choosing a new Brad it’s nice to choose one that a local installer carries and is familiar with just for future service and available parts.
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