The fan runs but supply air does not feel cool
Start with the symptom
AC Blowing Warm Air
Warm air at the registers can begin with controls, airflow, equipment operation, or the refrigeration side of the system. The symptom needs inspection before a repair is selected.
What you can document
The pattern is useful evidence.
Note when the symptom happens, which rooms or equipment are involved, and what changed before it started. That information makes an on-site diagnostic more focused.
Useful observations for AC Blowing Warm Air
Indoor temperature continues to rise
Cooling begins and then fades
Some registers feel different from others
Diagnostic pathway
What a technician may check next.
The exact inspection depends on the equipment, building, history, and conditions observed during the visit.
Potential diagnostic checks
D01
Thermostat mode, schedule, and call for cooling
D02
Filter condition and return-air path
D03
Indoor blower and evaporator-coil condition
D04
Outdoor-unit operation and qualified refrigeration diagnostics
Suggested starting point
HVAC Diagnostics + Repair
This page is symptom education, not a remote diagnosis. Breezy begins with the actual property and system.