I checked and replaced the filter. But now if I turn on the air conditioner and then turn it off, the outside unit continues running, it should not be. (Is this a contactor problem?) Thank you very much for your help. Yes it 'could' be a contactor problem, but it could also be some other problem that causes this action. You've already guessed a few times and are no closer to fixing this. It may be something as simple as replacing a contactor. But this part is an important part that controls your AC. It would be better to call a licensed HVAC contractor to solve this problem and possibly identify another problem with the upstairs zone control. Zone controls are more complex, really not intended to be home owner serviced. It sounds to me like you have more than 1 problem with your zoned AC system. I service the Katy, Texas area.

I found this note on page 11 of the installation manual under upflow units: NOTE: Where the maximum airflow is 1800 CFM or more, both sides or the bottom must be used for return air. This is saying the bottom return by itself will be enough. There was note under the upflow unit section, but I assume it also applies to a horizontal installation. You want the filter and grill cover to be at least the size of the opening to the furnace. Making the grille bigger is not going to help if return itself is smaller. I don't know how this is going to work with the filter size you quoted. I would think you would need two 14X24 filters. It would be nice if you get get a 4 inch filter instead of the 1 inch. Otherwise you will be changing the filter every month. The 6x6 stud obstruction should be removed and you want a tightly sealed return duct. The return duct should not have a right angle. It should be a curved elbow to make the 90 degree transition. Sharp angles create more air resistance. How big was the original house and AC, and much area are you adding? Most houses don't have the properly sized duct work to handle a 5 ton AC. Do you have confidence in this HVAC contractor?

Never heard of doing that for a central air compressor. Freon, the coolant, doesn't freeze, and there is no water in the compressor. I wouldn't bother. But if you have a washing machine, you should put anti-freeze in there. You want a specific kind, I think for boats. Run a "load" with just water and pour the correct amount of AF in with the load. That will get the anti-freeze into the well of water that doesn't get expunged from the machine. Disconnect the pipes and power and drain the pipes into a bucket.

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