Correct the cause of uncomfortable rooms
For Fair Oaks service, describe changes in room temperature, airflow and operating noise separately. A room that is always uncomfortable can need a different solution from a system that recently stopped producing heating or cooling.
Replacement planning should include the return path, filter arrangement and accessible duct condition. If equipment is in a tight service area, discuss access and maintenance clearances before selecting a physically larger replacement.
For rooftop units, bring room comfort and installation clearances into the scope discussion. A failed component may justify repair; repeated faults or a major failure can justify a scoped replacement comparison. Include building interfaces and access costs so proposals cover more than the rooftop cabinet.