Arrived to do a performance maintenance. Set up for combustion analysis temperature split and static pressure tests. Found that the system is operating with excessive static pressure. Verified operation of all mechanical and electronic components of the furnace. Checked blower for cleanliness and to see if there is any play in the bearings. Found that the fan for heating and cooling is collecting dust. Checked systems heat exchanger to ensure proper venting of flue gas. Performed an electronic gas leak search. Verified operation of the humidifier. Found that the humidifier panel is coated in calcium. With homeowners approval replaced the humidifier panel and replaced the filter media in the furnace filter. Sealed the backside of the filter slot to help ensure there is no air bypassing the furnace filter. Went upstairs and demonstrated how to clean the filters in the mini split. Furnace and humidifier are operational at this time.