Stumped by A/C problem
I am in HVAC Sales. I have a service customer whose system, installed by another company, cools fine until 5 or 6 pm. 2000 sf house, spray-foamed. The system is 4 ton and 2-stage cooling. It's a Comfortmaker. My Techs have been to the house several times but usually in the morning. One Tech spoke with Tech Support and filled out a report for Comfortmaker but said everything looked fine.
We suspected the 2nd stage wasn't coming on but the last Tech says it is. He didn't measure cfm but it heats fine all winter.
Has anyone out there had similar troubles with a Comfortmaker? This is the second system of that brand we haven't been able to diagnose but the neighborhood has 30 others that work well.
Any suggestions? Experience? It's a gas system, 16 SEER. About 3 years old.
I have the report in front of me if you need the readings.