Replace 4" air filter. CLEAR DRAIN BLOCK - USING NITROGEN ONLY LEVEL 1 CONDENSATE DRAIN LINES NEED TO BE CLEANED OR THEY CAN CLOG WITH ALGAE AND DEBRIS Includes shop vacuuming when necessary and 1 PVC Coupling Gas system from 2013 with a clogged primary drain line. Upon arrival the tenant showed me where the equipment was and where the drain terminated. Before starting I ran the restroom sink to make sure that was draining properly but unfortunately it was slow to drain so I did informed the homeowner to contact a plumber to address that issue after I clear out the ac line. After the flush and changing the air filter the system was running, cooling and properly draining. There isn’t any kind of warranty on this type of work. I also brought to the homeowners attention that his drain pan has rust, after seeing the video I sent him he wants to leave it as is since he’s planning on replacing the system later this year. System is on upon departure.