Perplexing Central AC problem
I am in need of some assistance, hopefully you folks can help me out.
I recently purchased a house with central A/C and radiant in-slab heat. My air handler for the AC system is located in the attic of my house (house is a ranch. 2,000 sq/ft)
Problem 1: I appears my system has developed a leak. Dealing with my home warranty (american home shield) has be less than ideal as the hvac contractor they hired appears to be unwilling to actually perform a leak test. They have been out twice in the last week to fill the system with freon. The last time they were out they also replaced a schrader (sp?) valve as he said this was the likely location of the leak. As of now, the system appears to be holding a charge but I am now seeing a new problem.
Problem 2: During the middle of the day my the AC does not adequately cool down the house. At night though the AC works exceptionally. I have taken measurements with an infrared thermometer and this is what came up with:
Middle of the day
Return: 78 degrees
Closest vent: 74 degrees
furthest vent: 78 degrees
Return: 75 degrees
Closest vent: 60 degrees
Furthest vent: 60 degrees
My question is why does it appear my system works well at night but horrible during the day? would low freon be the cause?
Something I read on another forum was that if your attic temperatures are too high and your air handler is up there than it could be saturated with heat. I just found out this morning that my roof mounted attic exhaust fan is not working. Could this be the problem?
Sorry for the long post, I'm just at my wits end and want the AC to work. Please help!