High Efficiency Dehumidification System (HEDS)

Winner of the 2016 Department of Energy FEMP JUMP Nationwide Energy Efficiency Competition, as well as the 2014 Department of Defense ESTCP Global Energy Effeciency Competition, Conservant System’s High Efficiency Dehumidification System (HEDS) is currently reducing dehumidification related chiller plant and boiler plant energy consumption by 40% to over 60% while reducing or eliminating biological growth and the associated health, wellness, productivity and hazmat remediation expenses. For retrofits or new construction no other technology compares in efficiency, simplicity, reliability and sustainability.

USACE Final Report

Read the final report issued by the US ARMY CORPS of ENGINEERS.


Conservant is an innovator company that serves our world by improving our environment while serving our customers with real-world ROI outcomes. Our technology is proven by real-world installations for the Department of Defense (DOD). But beyond our technology, we serve our clients with the questions we ask, the way we listen and the importance we place on following through with every commitment before, during and after every project.

As such, every relationship we engage in is process-engineered to the exacting demands and specifications of each client. Every client need is different and we realize that the details in how you are served will ensure a confident, successful installation regardless of the size or scope of the work. It is this best practice that allows us to form a relationship with such executional efficiency that it makes way for our partnerships to go beyond that into lasting friendships.

The Relative Humidity Control problem is real and the solution is Conservant Systems.

Improper and energy intensive Relative Humidity Control for buildings is a significant global issue.

Hundreds of millions of dollars are wasted each year in attempts to control relative humidity (RH) and biological growth in facilities across the U.S. Hundreds of millions of additional dollars are wasted on remediation and reconstruction work to reduce biological harm to people and facilities when HVAC systems are not successful in controlling biological growth. Even more waste and loss of life occurs due to negative health impacts associated with biological growth and Healthcare Acquired Infections (HAI's).

In addition to the total health and wellness related costs, controlling the relative humidity of air entering labs, clean rooms and manufacturing facilities consumes hundreds of millions of additional dollars annually due to the energy intensity of current market solutions.

To combat these problems, Conservant set out to develop a cost effective, energy efficient, maintainable, sustainable and scalable dehumidification and RH control solution.

The solution had to work in retrofit applications as well as new construction.

After substantial research, development and computer modelling, the High Efficiency Dehumidification System (HEDS) was born.

HEDS is a patent-protected, proprietary energy recovery method designed to save more than 40% of the cooling and heating energy related to the cooling, dehumidification and reheat process, while also eliminating the health, wellness, product and productivity loss risks caused by poor relative humidity control.

In hospital applications, HEDS can save lives by reducing Healthcare Acquired Infections (HAI’s).

HEDS is designed to be simple and easily maintainable, requiring knowledge of only basic HVAC system operations and is designed to be scalable, from the smallest room level equipment to the largest central system equipment,< 100 CFM to >1,000,000 CFM.

The basic idea of HEDS is very simple, and the need is global.

The HEDS process recovers 20% to 40% of the low quality heat generated in the cooling and dehumidification process and uses that heat for two purposes:

  1. 1: The reclaimed heat is used to completely eliminate the need for new reheat energy for Relative Humidity (RH) control, and;
  2. 2: The cooling load sent to the chiller plant from the HEDS AHU is reduced by the exact same amount of energy as is recovered to provide the reheat energy. The combined energy savings can exceed 60% during non-peak load conditions.

The actual chiller and boiler plant energy savings related to the cooling, dehumidification and reheat process can exceed 70% for certain loads in humid environments.

While there are a number of existing technologies on the market for dehumidification, they have significant limitations when compared with the HEDS system design, including:

  • Increased maintenance costs due to complexity of additional fluid stream, pumps, heat recovery wheels, heat exchangers, and components.
  • Potentially decreased CHW system temperature differential due to smaller coils and reduced inlet air temperatures to the cooling coil, leading to the “Low Delta T Syndrome”. This can increase central plant energy use and reduce cooling system capacity.
  • Poor temperature and RH control due to uncontrolled inlet temperatures from heat recovery coils.
  • Added regeneration heat energy and post-wheel cooling associated with some desiccant designs.
  • Much longer, taller or heavier AHUs.
  • Higher air pressure drop and fan energy due to additional upstream and downstream coils and wheels requiring more fan energy.
  • Condensate re-evaporation when water is blown off of the cooling coil.
  • Designs are not scalable to room or fan coil unit sizes, where many of the problems are found.

Military/Government related work includes

  • Fort Bragg, NC – High Efficiency Dehumidification System (HEDS) ESTCP test project showing 40% to 60% cooling load reductions and 100% reheat energy reductions for RH control.
  • Tinker AFB, OK, HEDS ESTCP test project showing 35% to 60% cooling load reductions and 100% reheat energy reductions for RH control.
  • Balboa Naval Medical Center - Evaluation, design and commissioning of energy efficiency upgrade projects for this 1,800,000 SF Navy medical center in San Diego.
  • Camp Pendleton Naval Hospital – Evaluation, design and commissioning of a new boiler plant, new chiller plant and new air handling units in a fully occupied 600 bed military hospital.
  • Guest speaker on controls, cooling system energy efficiency and high efficiency dehumidification systems at the US DOE/COE Technology Workshops in 2007, 2008, 2009, 2010, 2015, 2016 providing training to an international group of Engineers and operators.
  • Submarine Base, San Diego – Evaluation, design and commissioning of energy efficiency upgrade projects for the Navy, thru San Diego Gas and Electric.
  • Third Fleet Command, San Diego - Evaluation, design and commissioning of chiller plant and controls system optimization upgrade projects at this site. Savings have averaged over 60% per year for the past 7 years, with a separate utility meter on the plant proving out these savings, while serving an increased cooling load.
  • Fort Huachuca, AZ, Fort Shafter, HI, Schofield Barracks, HI, Fort Sill OK, Yuma Proving Grounds, Fort Jackson, SC, Fort Irwin, CA, Fort Leonard Wood, MO – Evaluation of energy efficiency and cost reduction projects related to chiller plants, DDC controls upgrades, cooling system optimization and High Efficiency Dehumidification Systems.
  • Energy Efficiency and Thermal Energy Storage projects have been completed on approximately 95 facilities for the State of California, The County of Orange, the County of Los Angeles and the County of Fresno.