Any HVAC technicians here can give me some advice?

[shilala]

When you set up a system, in order to get it tweaked to max efficiency you have to check the superheat. It amounts to taking a number of pressure/temperature readings and adjusting pressure to suit (via adjusting the freon charge).
Checking the expansion valve (txv) is incredibly easy. Why it wasn't done is beyond me.
My suggestion would be to find a real outfit who knows what they're doing. Ask around and try to get an old guy who's been at this stuff for awhile.
900 bucks to change out an expansion valve is ridiculous, too. You're just not having any luck at all. Sorry, brother.

[big a]

This is crazying I'm going through the exact same thing here at my house. Only thing is noone can even suggest what they feel the issue is. My R22 is full we are getting a 18* temp drop at the unit. However the temp rises in the house throughout the day over 80* when it is only *85 out side. I have a 2nd tech coming today and I have talked to a couple other people.

I would ask around and see if anyone can suggest another HVAC company. If not I would open up a phone book and start calling different places. See what their diagnostic service calls run. Might just be my location but I know a lot of reputable companies around here have very aggressive deals as they want all the work they can get.

Another idea to find a tech would be to look up local suppliers for the type unit you have. Give them a call and see if- 1. they do service calls and 2. If not they should have a service company they can suggest.

[shilala]

Originally Posted by big a

This is crazying I'm going through the exact same thing here at my house. Only thing is noone can even suggest what they feel the issue is. My R22 is full we are getting a 18* temp drop at the unit. However the temp rises in the house throughout the day over 80* when it is only *85 out side. I have a 2nd tech coming today and I have talked to a couple other people.

I would ask around and see if anyone can suggest another HVAC company. If not I would open up a phone book and start calling different places. See what their diagnostic service calls run. Might just be my location but I know a lot of reputable companies around here have very aggressive deals as they want all the work they can get.

Another idea to find a tech would be to look up local suppliers for the type unit you have. Give them a call and see if- 1. they do service calls and 2. If not they should have a service company they can suggest.

An 18 degree drop at the coil is more than usual, that's actually great.
Your tstat is most likely screwed up, and the condensing unit is shutting off when it shouldn't. Could be a lack of airflow or a freezestat, too.
Make sure all your vents are open and they all work. Women like to close vents.
If that doesn't get it, go to Lowe's and get a new tstat, or at least make sure the condensing unit is running when it's calling for cooling (I'm assuming there's not an airflow problem or a wonky freezestat that's holding the condenser out).