Quick answer
Rooftop unit service covers scheduled maintenance and repair of commercial package units: filters, belts, coils, condensate drains, economizers, electrical components, refrigerant checks and curb and anchoring inspection. In Miami, quarterly or twice-yearly service keeps RTUs efficient and prevents summer breakdowns.
Written by Sylvia Denton, HVAC Guides Editor. Updated 2026-09-22.
A rooftop package unit puts everything in one cabinet on the roof: compressor, both coils, blower, and often gas or electric heat. On a Miami flat roof, the cabinet can sit in air far hotter than the street temperature, collecting dust, leaves and salt. Belts stretch, filters load, coils foul, and drain pans fill with slime.
Maintenance catches those problems on a schedule instead of on the hottest Saturday of the year. Each visit covers filters, belts, coils, drains and electrical components, with readings recorded so trends show up before failures do.
Economizers deserve special attention in Miami. They are designed to bring in outside air when it is cool and dry, which rarely happens here. A stuck-open economizer floods the space with hot, humid air and makes the unit work much harder. We check and adjust them on every visit.
