Hi everyone. I am having problems cooling my house in the daytime. This site has many knowledgeable people and posts, so I hope you can give me some ideas. Sorry in advance for the long post—I am trying to give you all the info you could need.
Background: I just purchased my first house, a new construction home, 2396 sq ft, with new Trane equipment:
Outdoor Unit: XR13, 2TTR3036A1000AA
Indoor Unit: 2TXCC037AC3HCAA
Thermostat: Honeywell programmable
Location: SE Pennsylvania
The system will not cool the house in the afternoon and evening hours. The temp keeps rising on the thermostat and the system runs constantly from around noon or 1pm and shuts off around 11pm. I keep it on 73-74 and the temp goes up from there… Usually tops out at 78, 79, or 80. We sealed the equipment in the attic closet—it was nice and cool in there before the patches were put on!
HVAC Tech #1 (Hired by builder): Added refrigerant on his first service call.
Moved the attic fan to another part of the attic on his most recent service call.
HVAC Tech #2 (Hired by me, great guy, didn’t even charge me): Put temp patch on plenum to seal 5/8” gap against entire rear edge.
Patched all leaks in closet.
Readings, and written evaluation by HVAC Tech #2:
Outdoor unit was overcharged. Showing 33-degree subcool. Pressures were 315 and 95. Delta-T was 8-degrees. Pulled overage out. Got down to 15-degree subcool with a 19-degree Delta-T. tried for 10-degree subcool, which is manufacturer’s recommendation, but the Delta-T decreased. Suction pressure dropped more than the head pressure. It dropped to 65 pounds. Added more refrigerant to reclaim Delta-T until unit is properly fixed. Pressures are now 190 and 85 with the current charge. There is a 10-degree loss between supply at plenum and closest supply vent. Recommend vacuuming the system and recharging.
Everything is insulated in the attic. 2 people said there weren’t any problems up there. I found one return that wasn’t pulling any air in—that was not connected and was pulling attic air into the system. That has been fixed but the problem still exists. Another note: Neighbors (and the model homes) with the same sq ft and equipment are not having this problem. My line outside won’t sweat and is only cool. The others are all cold and sweaty. Any ideas? I don’t know what to do at this point. Thanks in advance for anything you could suggest.