you can get a coated coil from several places ...the dealer can usually provide one ... there is a company called technicoat near dallas and that would be your best bet to get a coated coil ... my coil is a single or 2 stage coil .... the 2 stage coil is designed to remove more humidity ... you would need to get ok by carrier that they will not void the warranty if you installed it ... i have had lennox amana and american standard approve it for us .. so it is just a procedure you have to do ... if you are interested let me know....