Just had a new roof put on my home and noticed the AC seems to be struggling a bit during peak afternoon hours with about a 77 degree indoor setting. 3 ton Carrier Split heat pump system only 2 years old. Single story home, AHU inside a closet indoors.
I'm trying to determine if maybe the new roof (going from 3-tab to architectural shingles) and a 15# felt to 30# felt might be the issue trapping more heat. Same color shingles as before (medium gray). Another change is the ridge vent - used to be a standard aluminum 18 sq in/ft net free air and now is a high-performance plastic low-profile Lomansco with just 11 sq in/ft net free air. When there is wind it pulls well, but in stagnant air it obviously does not have the same net free air space to vent.
The other thing I noticed is the liquid line entering the AHU becomes warm when running at temps over 85 degrees outside. Below 80 degrees the line is very cool to the touch. Is this normal or reflective of a charge issue, TXV issue or dirty outdoor condenser coil fins? (Visually they don't really appear dirty or clogged)
At peak afternoon heat around 90 degrees outside the attic temps are now running about 30+ degrees greater than outside temps. (120-125 range)
SO.....question I'm trying to narrow down is this: Is the AC functioning okay or is the attic just excessively hot due to something related to the new roof, which is then possibly effecting the AC performance? This isn't a DIY but just trying to get a direction on this before calling anybody to look at the situation. I figured the HVAC experts may have ran into this kind of thing before.