Hi Jim, They just replaced the coil and reloaded freon in the brand new HVAC system.

An A coil freezing up has nothing to do with a humidifier.

I brought an AC guy to look at it and he says yeah the coil is new in only one of the units, the other two have bad coils and they need replaced. $3k+.

Goodman 1.5 Ton 13 SEER Air Conditioner Condenser w/ R410A Refrigerant Model#: GSX130181  $623.99 Goodman 1.5 to 2 Ton 17 1/2" Air Conditioner Evaporator Cased Coil Model#: CAPF1824B6 $197.89

Last was a matching w/d and coil top white stove for $550 delivered, haul away, all-in.  

Deep clean the whole place, pull the fridge out and vacuum the coils, make sure all drains are working and sanitize them - stop and fill each sink with a mix of hot water, a splash of bleach, and several good squirts of Dawn dish soap.

Still in the very nice original box with the cord coil held with a long-since brittle rubber band.

I love the idea of heated floors and I think you can put the heating coils under almost any type of flooring, even concrete.The overhead blower wouldn't be very efficient, as heat rises.  

Although the filter really hasn't helped as the thing is beating itself to death.What you can do if you know a friendly AC man is get a 'new' inside unit (if it's the inside coils).What AC guys will not tell you is that you can easily match inside units to outside units as long as they are same tonnage, same type, and same gas.

Not an emergency and it's probably a bad compressor that has burnt up due to dirty coils, likely clogged with dog hair.