1 - 5 (TIME REQ). COD. Spoke to Andrew. Call this number day of when on the way!! - (909) 273-1527. We installed his system September last year; he would like his filter changed and AC serviced (quoted $158 for maintenance + filter price). Not sure what size MERV11 he has, bring both 16 & 20 inch, I quoted him the prices for them ($49 or $51).