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re: Any HVAC Professionals?

Posted on 5/8/19 at 10:03 am to
Posted by MayhemMike
Austin, TX
Member since Jun 2011
149 posts
Posted on 5/8/19 at 10:03 am to
I can't speak for the attic but the walls have the normal strips of cotton candy insulation in them. I got a recommendation from another hvac installer about making sure they used a smaller expansion valve since they mismatched the units. It could help.

I'll let you know what the original hvac installer says when they meet with me. They are already being rude and saying the parts are correct and there is nothing wrong without even coming out. Their soultion was to turn my ac cooler to take the humidity out.. I have it set at 71 with 74% Inside Humidity..

This will most likely be a battle.
Posted by PurpleAndGoldFinger
Baton Rouge, La.
Member since Aug 2004
1266 posts
Posted on 5/8/19 at 10:57 am to
As others have said, lots of variables. Number and size of windows, insulation, direction your home faces the morning and afternoon sun. Your contractor should have run a Manual J load calculation. Takes all this into the sizing of the system.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5558 posts
Posted on 5/8/19 at 11:09 am to
I have watched some YouTube videos where cooling problems was associated with incorrectly sized or faulty thermal expansion valve (TXV) or fixed piston/orifice, depending upon what your unit has, a TXV or piston/orifice. In fact a HVAC tech from Louisiana who post videos widely on YouTube posted one on cooling problem his personal new “used” house was having and the problem was an incorrectly sized expansion valve which he had to change out to the correct size to fix the issue

Sounds like you might need to pay a couple hours labor for a highly experienced HVAC tech to come and check your system. Maybe you’ve found one in the other guy you talked to.

I was going to ask if you’re sure your humidity meter is correct but your definitely going to feel humidity that exceeds 55-60%. Hopefully it’s going to be a simple fix and not a sizing issue. If you have pink fiberglass insulation in walls you likely have that in the attic but you should check. Is your air handler is in the attic or is it a closet in the conditioned area of the house?
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