Tech monitored system operation and found everything to be running, found no unusual noises coming from condensing unit. Tech did find that equalizer line was routed extremely close to fan blade. Tech pushed line away from blade. Also found system running a high head pressure in heat mode. Found blower set to lowest speed, adjusted blower speed to medium. Head pressure dropped and is within spec, evap coil is clean filters are slightly dirty. Recommended investing in maintenance agreement.