A/C unit not bringing temp down
Hello, I had a new trane XR 13 unit installed in 2008.
It seems to have been working great. but now, the temp out side is hitting 100deg and my a/c will only bring the temp inside down to about 78deg during the day. It will run all the time and then over night it will bring the temp to the setting 74 or 75 deg.
Does anyone think there is something wrong with the unit? It blows cold error out the vents.