Air Quality and Delivery Efficiency 

Taking the quality of indoor environments for granted can be costly. Poor air quality affects not only occupants’ comfort, attentiveness and performance, but also makes them more susceptible to illnesses, costing billions of dollars in lost productivity to organizations.

At the same time, building design strategies are mostly focused on energy efficiency, leading to unintended consequences. Continuously recirculation of old air contributes to unhealthy indoor environments because of the build-up of germs and potentially dangerous chemical pollutants.

The traditional way of overcoming this problem by increasing the amount of outside air brought into the building brings even more issues: more humidity, higher noise levels, and more energy demands.

So what’s the solution?

Improving indoor environments involves improving air quality and delivery efficiency, which can only be done with leading technology and the best service.

Unmet control of indoor environments requires specialized skills, broad experience, and technological expertise to properly apply the technology available.


SEMCO provides both the solutions and the support you are looking for. SEMCO’s global experience through FläktGroup and the thousands of successful projects around the globe prove that SEMCO can help you achieve the highest levels of indoor quality to meet and exceed your needs.

Product Line

SEMCO offers a complete line of desiccant-based products and systems that recover energy, increase ventilation and control humidity, which can be seen in thousands of applications worldwide.

The solutions offered go beyond the ASHRAE 62 requirements and exceed construction standards: with SEMCO’s True 3A technology you get the results you dreamed about, the space occupants receive best indoor air quality, and the building operator has a quick ROI through high energy savings.


Ascendant is a conventional cooling and active desiccant hybrid system especially designed for hospital operating rooms, archival and dry storage, hotel/condo buildings, and other applications requiring low dew point temperatures and supply air humidity levels as low as 15 grains.
Ascendant delivers low dew points (down to 20°F) while minimizing the tons of cooling input. Ascendant operates without the need for exhaust heat recovery and with 25% to 50% less energy cost than conventional refrigeration-based dehumidification systems.

SEMCO ascendant equipment


One of BuildingGreen’s Top 10 Products for 2018, 3efficiency offers you the peak of efficient hydronic systems in a package superior to all other systems.

The package includes:
1) Outstanding Pinnacle® dedicated outside air system (DOAS) that manages 100% of a building’s ventilation and indoor humidity load in a single package
2) NEUTON™ chilled beam pump module that manages the water system to allow for a building level occupant control that is not met by any other systems
3) Active chilled beams that provide comfort with low air velocities in the room by mixing the supply air with the ambient air

3fficiency is a great alternative to Variable Refrigerant Flow (VRF) that provides more savings through the use of a water-to-water chiller using the condenser water as the hot water for the system. 3efficiency allows you to exchange refrigerant for water, meaning:

• No more concerns with ASHRAE 15
• No refrigerant leaks
• No large electrical wire runs
• A whole building variable water flow system

If you are going green, these are the applicable LEEDv4 credits 3efficiency gives you:

EAp2: Minimum Energy Performance
EAc2: Optimize Energy Performance
EQc5: Thermal Comfort
EQp1: Minimum Indoor Air Quality Performance
EQp2: Enhanced Indoor Air Quality Strategies

3efficiency SEMCO

Data Center

SEMCO has a simple approach to address the basic market needs for current data center designs.

SEMCO’s system incorporates few components with a hydronic coil system that achieves a typical annual Power Usage Efficiency of 1.122 (for Washington DC area conditions).

Designed to handle a wide range of temperature, this system rejects heat for the data center and starts to economize at an outdoor ambient temperature within 10 degrees of the desired process side leaving air temperature, 20-30 degrees warmer than other air-to-air competitive options.

SEMCO data center


Ideal for renewable energy such as ground water for cooling and waste energy for heating, Econet is a reliable and efficient system to provide better Air Handling Unit Heat Recovery.

Unlike traditional run around coil units, this system uses minimal components for air transfer, resulting in a more energy efficient and environmentally friendly solution to your air quality needs.


• More compact unit and minimized pressure loss
• Energy efficient flexible cooling system
• High recovery rate for Constant or Variable Air Volume (VAV) systems

SEMCO Econet

EP Series

The EP Series offers the ultimate performance in the transfer of total latent and sensible energy.

The heart of this system is a technologically advanced True 3Å desiccant wheel. The wheel has a molecular sieve-desiccant coating that is selective in what it absorbs from an exhaust air stream. This selectivity allows True 3Å to be used in critical applications, including recovery from contaminated air streams.

By using the desiccant coating, True 3Å recovers the moisture from the exhaust air stream to the supply air stream without the airborne pollutants exchanging.

• The EP system and can be selected to precondition outdoor air going to other conventional air handling systems or as an integrated system that provides total space conditioning with additional heating and cooling options available.
• The airflow range of the EP/EPD system is 2000 to 70,000 cfm.
• It is available as both a single (EP) or dual (EPD) wheel system.

SEMCO EP series

FV Series

The SEMCO FV Series of outdoor air pre-conditioners reduces the energy required to heat or cool outdoor air by up to 80%, significantly reducing the cost of a facility.

The FV Series allows the HVAC system to accommodate the three-to-four-fold increase in outdoor air quantities, recommended by the ASHRAE Standard 62.

It also improves humidity control when combined with unitary heating and cooling equipment. Because the SEMCO unit preconditions the incoming air to the packaged equipment, the required refrigeration capacity may be reduced by as much as 50 percent. Thus, the cost of the FV pre-conditioner and its installation is typically offset by the reduced size of the conventional HVAC system.

The FV Series is available with an airflow range of 600 to 10,000 CFM.


Pinnacle Series

Pinnacle DOAS manages 100% of a building’s ventilation and indoor humidity load in a single package, responding to varying conditions on demand. It cools, heats, or dehumidifies as required, providing a steady stream of optimally pre-conditioned, high quality, comfortable air.

An integral part of the 3fficiency System, Pinnacle dehumidifies the supply air to very low dew points without the use of a regeneration heating source. Outdoor air is continuously delivered to the occupied space while simultaneously controlling humidity levels even at part-load conditions.

SEMCO Pinnacle Series