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New a/c freezes every day

2 years ago

I have a brand new a/c unit in an apt. building. 2 tons. Replaced condenser and air handler. It is a cooling only system. The coil freezes solid every day no matter the thermostat setting. I've had 3 different techs look at it several times including the original installer. Freon is perfect. Tried 3 different kinds of filters and no filter at all. Still freezes. Brand new blower working perfectly. All ductwork clear and clean. All vents open. It is a 650 sq. foot apartment. The old unit was 1 1/2 ton and the new one is a 2 ton. My tenant is now moving because i can't get anyone who can fix it. Any ideas what the problem is?

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