A dish room that drips condensation on tray stacks and slimes the floor is a humidity problem and a ventilation problem before it is a refrigeration problem. The fix is almost always exhaust capture and makeup-air balance, not a new air handler.
A high-temperature dish machine vents 200–400 CFM of saturated steam at 180 F+. If the exhaust hood over the machine doesn't capture it and the makeup air is warm-humid Tampa Bay outside air, the dish room turns into a sauna.
Florida Department of Education SREF requires Type II ventilation hoods over warewashing equipment. If the hood is missing, undersized, or not running, no AHU downstream will fix it.
A Type II hood with a 400 CFM rated fan is doing nothing if the dish operator left it off. First check the switch.
Next check sizing: most undersized hoods on K-12 cafeterias built before 2008 lack the capture velocity for the modern dish machine they were paired with later. Replacement hood plus exhaust runs $4,500–11,000.
Exhaust without matching makeup air pulls negative pressure on the kitchen, drags warm-humid corridor air into the dish room, and condensation collects on the coldest surface — usually a tray rack or the side of a walk-in.
Makeup air should equal 80–90% of exhaust. On older Hillsborough and Pinellas school kitchens, the original makeup-air unit may be undersized or non-functional; the fix is a properly sized DOAS or makeup-air handler.
A kitchen AHU set to a 75 F thermostat will satisfy temperature in a dish room before it satisfies humidity. The compressor short-cycles, the coil can't pull moisture, and you get 75 F at 75% RH — visible drips.
Specify a kitchen AHU with reheat or a humidistat-driven control sequence. On dish rooms specifically, a dedicated DX dehumidifier ($3,500–7,500) is often the cheapest path.
Dish-room floor drains plug with food residue. The dish machine drain doubles up. Standing water evaporates back into the room.
PM the floor drains weekly. Verify the dish machine condensate goes to drain and not to the floor.
Cold surfaces in a humid room sweat. Walk-in walls adjacent to a dish room, uninsulated chilled-water lines, or refrigeration suction lines all condense moisture out of dish-room air.
Insulate any cold surface within 10 feet of the dish machine. Cheapest fix on the list once exhaust and makeup are correct.
Hillsborough, Pinellas, and Pasco districts have hundreds of dish rooms across K-12 sites, many of them in buildings 30+ years old. The summer-shutdown PM window is the right time to inspect hoods, makeup-air, and AHU sequencing.
Suncoast Cold Systems handles Type II hood replacement and kitchen AHU sequencing under our commercial HVAC scope.
Almost always: dish-machine steam exhaust isn't captured, makeup air isn't balanced, and AHU control isn't sequenced for humidity. Fix exhaust first.
Type II for warewashing — Florida DOE SREF and the Florida Mechanical Code require it. Type I is for grease-bearing cooking exhaust.
50–60% RH at 75–80 F is the working target. Above 70% RH, condensation begins on cold surfaces.
It will mask the symptom if exhaust is sized correctly. If exhaust is wrong, a dehumidifier will run continuously and still lose. Fix exhaust first.
Suncoast Cold Systems handles exactly this kind of commercial refrigeration issue across Tampa, St. Petersburg, Clearwater, Brandon, Riverview, Temple Terrace, and Wesley Chapel. 24/7 dispatch. Licensed Class A A/C Contractor (FL #CAC1824642), EPA 608 Universal, OSHA 30 Construction.
Equipment heat gain and exhaust makeup-air are the two loads most contractors miss.
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