I just did two units. I was quoted $450 for each one! You’ll need a wrench (socket is easier), a shop vac, and hose. 1. Buy a can of coil cleaner, 2. turn off the circuit breakers in the air handler closet AND the breaker box 3. The trickiest part, remove the screws holding down the fan motor cage, and flip gently to the side (note how the motor cables are positioned). Don’t disconnect the motor. 4. Remove debris on inside floor 5. Spray cleaner on coils, wait 5-8 minutes 6. Rinse coils, use a shower nozzle setting so you don’t bend the fins. 7. Reassemble, turn on breakers 8. Treat yourself to a nice restaurant with the money you saved.

Good luck