Performed AC cool check. Checked electrical, mechanical, safety, and performance of the system. Reme-Halo air purifier has failed and is not functional. No other major issues were found. Drain line cleared and treated. Condenser coil cleaned. Options for replacement of air purifier were presented to the customer and they chose to have the Reme-Halo replaced with the Synergy system. Repair was completed. Electrical disconnect confirmed in and on. System was running at the time of departure.