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 gas & propane wall furnace repair, bring room comfort and installation clearances into the scope discussion. Identify the brand, model and fuel before discussing repair or replacement. Williams and other wall-heater product families have different designs and part requirements. Any fuel conversion must use approved equipment-specific methods and qualified installation.