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thanks everyone. incredibly helpful. I am going to get a second opinion.

I guess some other info about how it stopped working might be useful. I had one service call last week when it first stopped working. I had changed a very clogged filter, but the tech said I had an...

the system did work for a couple months -- june and most of july. would it not have worked at all if he didn't change the valve?

Funny how yesterday I knew nothing about HVAC and today I have learned so much. . . . What I'm pretty sure I've got now is -

1. a Carrier unit model CNRVP3617ATAABAA inside that uses R-22...