Our dream was to build a dehumidifier that
solved the industry’s most challenging issues.



  • A dehumidifier that uses only a fraction of the refrigerant charge required in traditional systems
  • Factory sealed refrigeration even on split systems
  • The most stable room conditions, smoothest operating performance and peak energy efficiency
  • No limitations on the remote AC cooler location
  • The longest lasting and most reliable dehumidifier in the industry

Here’s how we did it.


NP Series

Seresco NP Series Indoor Pool Dehumidifier

Our revolutionary NP or Natatorium Protocol Series is the biggest industry innovation in 20 years and the future of dehumidification.

A traditional natatorium dehumidifier requires a large refrigerant charge that is not just expensive, but also leads to oil and refrigerant migration control challenges that can impact compressor reliability. Traditional split systems also severely limit the distance between the unit and its remote AC condenser.

Through the use of a secondary heat exchange fluid, our ingenious NP Series overcomes both of these issues and more. Our NP Series also provides superior humidity control, exceptional reliability and lower operating costs, with as little as 1/6th the traditional refrigerant charge.

For applications requiring 100 to 840 lbs/hr hour of moisture removal or 6,800 CFM to 70,000 CFM of air handling, our NP Series beats the competition hands down – in every design consideration – every time!


Additional Insights

  • The ultimate in stable indoor air conditions through fully modulating reheat
  • Tried and proven technology
    • Dry coolers have been used in the precision air conditioning industry for decades
    • Seresco‘s innovations make this available for natatorium dehumidification
  • Factory sealed refrigeration circuit – no expensive site refrigeration work
  • Greatly reduced cost of ownership
    • Up to 85% less refrigerant charge!
    • Significantly less cost to install and maintain compared to alternative refrigerant systems
    • Compliant with ASHRAE Standards 15 & 34
    • Less refrigerant means lower environmental risk and additional LEEDs points
  • Energy efficient: Seresco‘s proprietary heat rejection design makes the Protocol series 5-7% more efficient compared to all traditional DX systems throughout the year
  • All seasonal refrigerant and oil migration issues to the outdoor condenser are totally eliminated
    • Decreased risk of compressor damage
    • Lower maintenance costs
  • Air cooled AC heat exchanger uses only one set of PVC pipes instead of a copper line set for each compressor
    • Greatly simplified installation
    • Reduced labor and material costs
    • Threat of copper pipe theft is eliminated
  • Air cooled AC heat exchanger can be located a considerable distance from the unit
    • Greater installation flexibility for split system configurations
  • Available as indoor split or outdoor packaged (or split) system
  • Can be equipped with auxiliary air heating, and a variety of ventilation options including purge, air conditioning and heat recovery
  • Fully compatible with Paddock Evacuator

Specification Sheets

The specification sheets below are a representation of fully loaded units.

  • Pool water heating option
  • Exhaust with heat recovery
  • Purge mode with economizer
  • Air conditioning – air cooled or water cooled, split or packaged
  • Auxiliary air heating (electric, hot water, steam or gas)
  • Motorized outdoor air on/off damper tied to built-in 7-day time-clock
  • Outdoor air ventilation built-in, complete with filter and manually adjustable damper
  • WebSentry Internet monitoring and control
    • Factory start-up and support via the Internet
    • Seresco Sentinel performance monitoring 24-7
    • Preventative maintenance e-mail alerts
    • Trouble warnings via e-mail
    • Browser-based access and control
    • Smart phone access and control
  • Unrivaled 1-year labor warranty with WebSentry connection
  • 2-year warranty on parts
  • CommandCenter Control System with optional touch screen interface
    • The most sophisticated and powerful controller in the industry
    • Integrated BACnet, LON and Modbus connectivity
  • Service Vestibule Outside Air Stream – On All Units
    • Critical components outside of chlorinated air stream
    • Maximum AC efficiency, no heat gain from warm components
    • Easy to service even while unit in operation
  • Direct drive fans, backward inclined airfoil plenum
    • Quiet, powerful, efficient, reliable, energy efficient
    • Higher static pressures
    • Quieter operation & greater energy efficiency
    • Allows for factory installed auxiliary air heating
    • Offers maximum flexibility for supply air duct options
    • No belts to adjust, wear out or replace
  • Fully dipped coils for 100% corrosion protection – not just the fins!
  • Extraordinary compressor protection
    • Refrigeration pressure transducers on suction and discharge – unique to Seresco
    • 24/7 monitoring of critical suction and discharge pressures
    • Pump down, crankcase heater, voltage monitor
    • Suction accumulator, oil separator, oil monitoring
  • Sight glasses on receivers for easy field charging of split systems
  • Multiple compressor systems for staged control
  • Flexible supply and return air openings – multiple openings also possible
  • Mechanical vestibule outside the airstream makes service a breeze
  • Mirror configurations available for all models to suit duct work requirements
  • Best cabinets in the industry
    • 2-inch insulation
    • Double wall construction, door holders
    • Rain-guards over the doors
  • Outdoor packaged and split available, air-cooled or dry cooler
  • Roof curb or slab compatible base design
  • Motorized evaporator bypass damper for proper evaporator loading and maximum efficiencies
  • 2-Inch pleated filters standard
  • Service technicians have smart phone access and control