Educational buildings, from preschools to universities, are among the most demanding environments for HVAC design. Nearly 56 million people in the US spend their days inside schools (1). In the European Union, that number rises to 94 million pupils and students enrolled across all levels of education as of 2022.
These spaces must strike a balance between thermal comfort, indoor air quality (IAQ), and efficiency across a wide range of room types and usage patterns. The stakes are high: thermal discomfort and poor air quality can directly impact student performance, staff productivity, and even long-term health outcomes.
Fan coil units (FCUs), particularly hydronic (water-based) systems, offer a compelling solution. But to be effective, they must be tailored to the unique challenges of educational applications.
This article explores those challenges in depth and presents why Polar Air intelligent hydronic FCUs are the ideal choice.
Global growth of HVAC in education
The global HVAC market is projected to grow from $241.5 billion in 2024 to $445.7 billion by 2033, with the commercial sector (including education) expected to grow at a rate of 7.6% (2). This growth is driven by:
- Urbanization and new school construction in the Asia-Pacific.
- Retrofit demand in North America and Europe, where aging infrastructure and stricter energy regulations are pushing schools to upgrade.
- Climate adaptation in Australia and New Zealand, where extreme temperatures are increasing the need for efficient, scalable HVAC systems.
Regional challenges in educational facilities
| Region | Key Challenges | Preferred Solutions |
|---|---|---|
| USA & Canada | Aging infrastructure, IAQ compliance (ASHRAE 62.1), demand for BMS integration, extreme heat and cold | Easy to retrofit, BMS with BACnet/Modbus communication, higher air purification and filtration |
| EU | Decarbonization targets, limited ceiling space in older buildings, EN 16798 compliance | EC motors, alternatives to VRF, 4-pipe FCUs, integration with district heating or cooling |
| Australia & New Zealand | High cooling loads, preference for plug-and-play systems, limited skilled labor | Console and cassette FCUs with EC motors, factory-tested units, easy to install with minimal maintenance |
| Asia | Rapid urbanization, high humidity levels, mixed-use educational buildings, cost sensitivity | Scalable FCUs, easy installation, EC motors and flexible control logic |
| Latin America | High occupancy density, older buildings lacking insulation, limited budgets, uneven policy enforcement | Thermal insulation and low-emissivity materials, humidity management, improved IAQ, long-term energy efficiency, integration with district cooling |
Challenges in educational HVAC design
01Â Â Indoor Air Quality (IAQ)
IAQ is critical for health and academic performance. Poor air quality can reduce cognitive performance by up to 15% and increase absenteeism.
Common issues include respiratory irritation, fatigue, and reduced concentration (3).
Regulatory bodies like the EPA and WHO recommend fresh air intake and high-efficiency filtration (MERV 8 or higher) to combat poor IAQ.
02Â Â Diverse room requirements
Educational buildings contain classrooms, labs, gyms, and offices, each with unique thermal loads and occupancy patterns. Centralized HVAC systems often struggle to meet these needs, especially in older buildings with limited duct space.
Hydronic FCUs offer zoning, scalability, and modularity for tailored comfort.
03Â Â System complexity & integration
Schools often avoid classroom thermostats, preferring centralized control via BMS. This requires open communication protocols (BACnet, Modbus, etc.) and group control functionality to operate the system without manual intervention.
Hydronic FCUs with intelligent controls simplify integration and reduce maintenance.
04Â Â Comfort vs. efficiency
Refrigerant-based systems can use up to 30% of energy for fluid transport, whereas hydronic systems use less than 2% to move water. This efficiency gap is particularly critical in schools, where HVAC systems often operate for 10 hours or more per day.
Hydronic systems also avoid the environmental and regulatory risks associated with refrigerants.
05Â Â Budget constraints
Schools are under pressure to reduce operational costs and carbon footprints while maintaining optimal indoor conditions.
Budget limitations often delay HVAC upgrades and maintenance, worsening IAQ and comfort. A 2020 U.S. Government Accountability Office report found that 41% of public school districts need to replace or update HVAC systems in at least half of their schools (4).
Skilled labor shortages further complicate maintenance.
06Â Safety and regulatory compliance
One major issue is refrigerant leakage. Refrigerants like HFCs can have a global warming potential thousands of times greater than COâ‚‚, and leaks can cause respiratory irritation or skin sensitivity.
Humidity control is another critical factor. Mismanagement can lead to mold, which can worsen or trigger asthma, allergies, and other respiratory problems in students and staff. To mitigate these risks, maintaining indoor humidity between 30% and 60% is crucial (5).
Schools must comply with ASHRAE 62.1 (IAQ), ASHRAE 90.1 (efficiency), EPA refrigerant rules, and EU F-Gas regulations. Hydronic systems use water, a safe and non-toxic medium that supports humidity control.
Climate change concerning schools
Climate change is increasing cooling needs in schools and universities. In the U.S., cooling degree days rose 34% during the back-to-school period over the past decade (6).
This trend is not isolated to North America. In Europe, Australia, and parts of Asia, longer and more intense warm seasons are pushing schools to extend cooling operations well into spring and autumn. In many regions, buildings originally designed for heating-dominant climates are now struggling to cope with sustained heat loads.
The consequences of inadequate cooling go beyond discomfort. Research shows that a 1°F increase in average school-year temperature is associated with a 1% drop in student learning outcomes (6). High indoor temperatures reduce concentration and increase absenteeism. Schools in low-income areas are especially vulnerable due to outdated infrastructure.
Despite rising cooling demand, heating remains essential due to unpredictable weather patterns, like more frequent cold snaps, even in typically mild regions. HVAC systems must be flexible, capable of switching between heating and cooling efficiently. Hydronic FCUs are well-suited to this challenge.
Polar Air fan coils for educational spaces
Integrating Polar Air hydronic fan coil units in educational spaces, such as schools and universities, can significantly enhance comfort, air quality, and energy efficiency, particularly in regions like Europe and North America, where demand for flexible, high-performance solutions is increasing.
Key benefits include:
Centralized control
Group control and BMS integration via Modbus RTU or BACnet, enabling centralized temperature regulation. Ideal for campuses seeking consistent, tamper-proof control across multiple zones.
Energy efficiency
Hydronic systems use less than 2% of energy for heat transport, plus Polar Air’s ADBS technology maintains a constant ΔT, reducing energy use and eliminating the need for PICVs.
IAQ and humidity
Polar Air units come standard with MERV 4 filters (MERV 8 or higher optional) and support fresh air intake, reducing airborne contaminants. 4-pipe configurations and modulating valves enable precise humidity control to prevent mold.
Low maintenance
Factory-tested units feature plug-and-play control boxes, integrated drain pumps, and easy-access components. This reduces downtime and simplifies servicing - critical in educational settings where downtime can impact learning.
Adaptability
With over 1,800 configurations, including cassette, highwall, and console / floorstanding units, Polar Air systems suit classrooms, auditoriums, libraries, offices, and gyms.
Global standards
Polar Air FCUs are ETL, AHRI, and Eurovent certified, ensuring compliance with North American and European performance and safety standards.
Conclusion: designing for the realities of educational buidlings
Schools and universities face growing HVAC challenges, including rising cooling demands, stricter IAQ standards, and aging infrastructure. Hydronic fan coil systems, when thoughtfully applied, offer a flexible, efficient, and safe solution tailored to these needs.
Polar Air’s systems are engineered to directly meet these challenges, featuring centralized control, modular design, and IAQ-enhancing features.
As educational institutions modernize, HVAC systems must be more than compliant. They must be purpose-built for learning environments.
References
(1) https://www.epa.gov/iaq-schools/how-big-problem-poor-indoor-air-quality-iaq-schools
(2) https://www.grandviewresearch.com/industry-analysis/hvac-equipment-industry
(3) https://www.epa.gov/iaq-schools/reference-guide-indoor-air-quality-schools
(5) https://www.epa.gov/mold/brief-guide-mold-moisture-and-your-home
(6) https://www.climatecentral.org/climate-matters/cooling-schools-in-hotter-climate
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