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 both heating and cooling is coated in dust debris. Checked systems heat exchanger to ensure proper venting of flue gas. Found that the evaporator coil is impacted with debris. Homeowner mentioned that the air conditioner stopped working. Went outside and diagnosed the outside unit. Found that the condenser fan motor is seized and will not operate. Spoke with homeowner about the system. Furnace is operational at this time.