In HVAC system design, fan coil units (FCUs) are often perceived as just terminal units. However, these essential components play a crucial role because they directly interact with the air in any given space. This means that fan coils have a significant impact on indoor air quality, occupant comfort, and the overall energy consumption of the HVAC system.
Hydronic-powered FCUs deserve attention early in the design process to ensure optimal performance and efficiency. This approach enhances the effectiveness of the HVAC system and creates the ideal indoor climate for its users.
Hydronic fan coil statistics
Hydronic or water-powered fan coil units comprise a significant portion of the global fan coil unit (FCU) market. This dominance and growing demand highlight why FCUs should be considered earlier in the design process. Understanding their role in HVAC systems is crucial for optimizing performance and efficiency.
Market share
Hydronic (or water-based) fan coils account for approximately 60-70% of the total market.
Growth rate
The hydronic HVAC market, which includes fan coil units, is expected to grow at a compound annual growth rate (CAGR) of 6.3% from 2025 to 2030.
Global popularity
Hydronic systems are popular in regions with firm energy efficiency regulations and green building standards, such as Europe and North America.
What is the role of fan coils in HVAC system design?
A hydronic fan coil unit, comprising a fan, a coil, and a filter, is an integral component of HVAC systems. It regulates the temperature within a space through heat exchange, making it critical to the overall performance and sustainability of HVAC systems.
The fan draws air from the room or a connected duct system. It then directs the air over the coil, which contains either hot or cold water. This coil is responsible for heating or cooling the air, depending on the desired temperature. A heat pump, central chiller, or boiler system supplies the water within the coil. As the air passes over the coil, it undergoes a heat exchange process, where it either absorbs heat from the coil (in cooling mode) or releases heat to the coil (in heating mode). The conditioned air is then filtered to remove dust and particles, enhancing indoor air quality, before being recirculated back into the room.
The entire process is regulated by a thermostat, handset, or controller, which controls the flow of water through the coil to maintain the set temperature. This efficient mechanism allows FCUs to provide precise temperature control, contributing to the overall comfort and energy efficiency of the HVAC system.
Benefits of early FCU integration into system design
Integrating hydronic fan coil units early in the HVAC design process can greatly enhance system performance and efficiency, especially in regions where FCU demand is rapidly increasing like Europe and North America.
Key benefits include:
Energy efficiency
Leveraging the superior energy efficiency of hydronic FCUs from the start can lead to significant energy savings.
Advanced controls
FCUs that include control logic, like Polar Air’s Auto-Dynamic Balancing System, delivers significant advantages for the broader HVAC system like stabilizing ΔT.
Humidity control
Considering FCUs with improved dehumidification features can maintain optimal humidity, preventing issues like mold growth.
Flexibility
Early planning provides flexibility to choose from various configurations like ceiling, floor, wall-mounted, or ducted units.
Improved indoor air quality
Understanding the application health needs means FCUs with advanced filters can be considered. These enhance indoor air quality by removing dust, pollen, and other particles. Particularly important in schools, care facilities, and hospitals.
Optimized FCU selection
Early identification of needs means choosing the right fan coil (2-pipe for single-mode, 4-pipe for simultaneous heating/cooling). It also means the FCU can be customized to varying conditions like occupancy and usage.
Integration with BMS
Ensuring the FCU has relevant integration with other building management systems leads to improved energy efficiency, easy control and a smarter, more responsive building environment.
Cost effectiveness
Quality design means fewer components that could fail, reducing long-term maintenance costs. As HVAC systems typically account for up to 40% of a building’s energy usage [3], early consideration of FCUs can result in cost savings.
How Polar Air can help with HVAC system design
Polar Air Select Software is an advanced tool developed to assist HVAC professionals in designing efficient systems. It is particularly useful for selecting and specifying fan coil units, ensuring they are integral components of the overall system.
Polar Air Select Software is a powerful tool for HVAC professionals to streamline fan coil unit selection and system design. By integrating it early in the project, users can optimize efficiency and performance with tailored, precise solutions.
The platform offers a user-friendly interface, flexible parameters for various facility sizes, and a new project manager and submittals feature that lets users configure units and generate detailed PDFs with specs like dimensions, performance data, and accessories.
Overall, it simplifies workflow, saves time, and enhances the design process, making it an essential tool in HVAC system planning.
Polar Air’s Auto Dynamic Balancing system automatically regulates air and water flow for precise thermal distribution, eliminating hot and cold spots and improving system efficiency.
Polar Air Pre-Sales
01Â Â Consultation & advice
Thorough consultations and analysis with our expert team to understand your project needs and goals.
02Â Â Â Customization options
Multiple options available* including different connection configurations, unit dimensions, and color options.
03Â Â Advanced tools
PA SELECT software for precise product selections, Revit/BIM files for planning, and technical data sheets.
04Â Â Polar Air Academy
Product, installation, and maintenance training to equip your team with the skills needed for success.
05Â Â Sales & engineering experts
Support your project from start to finish, providing valuable guidance on selection and application assistance.
06Â Â In-house procurement
Supply chain control with competitive pricing and logistics to reduce complexity and lead times.
Our trusted network of authorized representatives ensures you receive exceptional customer service and product availability worldwide.
Polar Air After-Sales
01Â Â Technical Support
Dedicated technical support team, available via Helpdesk, to resolve any product or installation issues.
02Â Â Warranty & spare parts
Warranty coverage and readily available spare parts mean that your fan coils remain in top condition.
03Â Â Maintenance advice
Troubleshooting and maintenance advice to keep your fan coils running at their optimal performance.
Conclusion: early fan coil consideration in HVAC system design
At Polar Air, we believe in setting ourselves apart by considering hydronic fan coil units early in the HVAC design process. This proactive approach ensures that our FCUs are perfectly integrated, leading to improved performance, enhanced air quality, cost savings, and better well-being for occupants, ultimately contributing to the success and longevity of the entire HVAC system. By enhancing indoor air quality and comfort, we meet the essential needs of our clients.
In a market where client satisfaction, sustainability, and energy efficiency are crucial, our focus on early FCU integration underscores our commitment to providing advanced, customized climate solutions.
Fan coil units are more than just terminal units; they are key to creating effective and efficient HVAC systems.
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