I have a 200 sq ft second story vaulted ceiling room. The ceiling is the roof. I think there's R19 fiberglass insulation above the drywall ceiling. The walls are 6" with maybe R29 insulation. There are 3 large windows that make up about 2/3 the wall volume on walls facing East, South-East, and South. The windows have a low E film, and wood blinds.
I have excellent AC going to the room with the use of zoning. However, the room still requires a great deal of AC to keep it at 78 degrees during the day. Even at night when the temperature drops to the mid to high 60s, the morning temp of this room will be 77 degrees (no AC). The other upstairs rooms in the house will be around 75 degrees in the early morning. If there wasn't enough insulation in the walls and ceiling, wouldn't this room be much colder in the morning?
I think I've done everything imaginable to improve the cooling in the room. My next step might be to investigate the insulation in the walls and ceiling. Would a laser infrared thermometer be a good tool to determine hot spots caused by poor insulation in the ceiling or walls? Or is this just a waste of money? What ceiling or wall temp would be considered excessive? I've checked around the light fixture boxes and there is insulation. Maybe the whole problem is the large volume of double pane glass windows relative to the size of the room.
I'm just out of ideas as to what else can be done to improve this room. I've had several HVAC contractor look at it too, and that resulted in zoning which works great. Thanks for any suggestions.