Breaking: Wisconsin-based HVAC giant introduces hybrid rooftop technology combining ventilation and dedicated outdoor air system capabilities in a unified platform
In a strategic move that challenges traditional rooftop unit design philosophy, Greenheck Fan Corporation has launched its groundbreaking Model RT series, a revolutionary line of rooftop units that fundamentally reimagines commercial HVAC by bridging the functionality gap between conventional rooftop ventilators and dedicated outdoor air systems (DOAS). The April 2025 launch represents the culmination of extensive R&D investment and marks Greenheck’s bold entry into the competitive packaged rooftop unit market.
Greenheck’s new line of rooftop units, designed for mixed air applications, bridges the gap between traditional rooftop ventilators and dedicated outdoor air systems. Model RT, equipped with industry-leading features as standard, simultaneously controls both temperature and humidity to optimize indoor comfort.
Table of Contents
Revolutionary Design Philosophy: The Mixed Air Advantage
Hybrid Functionality Breakthrough
The Model RT represents a paradigm shift from traditional rooftop unit design by incorporating mixed air capabilities that have historically required separate systems. The Model RT controls temperature and humidity for indoor comfort. This dual-functionality approach addresses the growing demand for improved indoor air quality while maintaining the installation simplicity and cost-effectiveness that make rooftop units attractive for commercial applications.
Traditional rooftop units primarily focus on space conditioning using return air, while dedicated outdoor air systems handle ventilation requirements. The RT series eliminates this dichotomy by seamlessly integrating both functions in a single, factory-assembled package.
Advanced Performance Integration
Model RT simultaneously controls temperature and humidity to deliver optimized comfort. This simultaneous control capability represents a significant advancement over conventional systems that often struggle to maintain precise humidity control while meeting temperature setpoints, particularly during shoulder seasons when latent loads dominate.
Technical Specifications and Engineering Excellence
Energy-Efficient Compressor Technology
Energy-efficient features include inverter scroll compressors that modulate to deliver precise cooling and dehumidification performance while improving part-load efficiency. The incorporation of inverter-driven scroll compressors enables variable capacity operation that precisely matches building loads while significantly reducing energy consumption compared to fixed-capacity systems.
Modulation Benefits:
- Precise cooling delivery eliminates overcooling and excessive cycling
- Enhanced dehumidification performance through lower evaporator temperatures
- Improved part-load efficiency ratings that reflect real-world operation
- Reduced electrical demand charges through smoother power consumption
Advanced Fan Technology
Direct drive supply and exhaust fans offer a wide performance range and standard modulation capabilities for variable air volume (VAV) systems. The direct-drive configuration eliminates belt maintenance while providing superior speed control and efficiency across the entire operating range.
Fan System Advantages:
- Modulating capability supports VAV system requirements without external controls
- Direct drive eliminates belt slippage and maintenance intervals
- Enhanced part-load performance through precise airflow control
- Reduced mechanical noise through variable speed operation
Condenser Fan Innovation
Electronically commutated (EC) motors on condenser fans modulate to control head pressure and improve efficiency. EC motor technology provides superior efficiency and control precision compared to traditional PSC motors while enabling advanced head pressure control strategies.
EC Motor Benefits:
- Head pressure optimization across varying ambient conditions
- Significant energy savings compared to fixed-speed condenser fans
- Enhanced system reliability through reduced motor heat generation
- Improved low-ambient operation capabilities
Cabinet Construction and Acoustic Performance
Premium Construction Standards
The RT’s cabinet features a prepainted exterior and double-wall construction with injected foam insulation to minimize sound transmission and air leakage. This construction methodology addresses two critical concerns in commercial rooftop unit applications: noise control and energy efficiency.
Construction Features:
- Double-wall design provides superior structural integrity
- Injected foam insulation eliminates thermal bridging
- Prepainted exterior offers enhanced corrosion resistance
- Minimized air leakage improves energy performance and indoor air quality
Control System Intelligence and Integration
Factory Programming Advantage
Factory-programmed controls simplify start-up, allowing for easy field adjustment and flexible unit operation in various applications. This approach significantly reduces installation time and commissioning complexity while ensuring optimal performance from initial startup.
Control System Benefits:
- Reduced commissioning time and costs
- Consistent performance across installations
- Simplified field adjustments for varying applications
- Enhanced troubleshooting capabilities through standardized programming
Advanced Building Integration
The RT series incorporates modern communication protocols enabling seamless integration with building automation systems. This connectivity supports comprehensive energy management strategies and remote monitoring capabilities essential for modern commercial buildings.
Comprehensive Options Portfolio
Heat Pump Technology
Available options to meet project needs include air-source heat pumps (up to 30 tons) for all-electric cooling and heating. The heat pump option addresses the growing demand for electrification in commercial buildings while providing efficient heating performance across varied climate conditions.
Heat Pump Advantages:
- All-electric operation supports building decarbonization initiatives
- High-efficiency heating performance in moderate climates
- Single-system solution for year-round conditioning
- Reduced infrastructure requirements compared to dual-fuel systems
Modulating Hot Gas Reheat
Modulating hot gas reheat (HGRH) for optimal comfort without overcooling. This feature addresses a common challenge in humidity control applications where traditional reheat systems waste energy by overcooling and then reheating supply air.
HGRH Benefits:
- Energy-efficient dehumidification in high-latent load applications
- Precise humidity control without temperature penalties
- Reduced operating costs compared to electric or gas reheat
- Enhanced occupant comfort through stable temperature and humidity
Exhaust Air Management
Modulating powered exhaust to maintain space pressure. This capability enables the RT series to function effectively in applications requiring precise building pressurization control, such as laboratories, cleanrooms, and healthcare facilities.
Gas Furnace Integration
Modulating gas furnaces for tighter temperature control while heating. Variable-capacity gas heating provides superior temperature control while improving efficiency compared to single-stage burners.
Available Configurations and Capacities
Current Model Range
Model RT is currently available in two cabinet sizes: RT-70 with airflow from 2000 to 7900 cfm, and RT-120 with airflow from 3500 to 13000 cfm. This initial range addresses the most common commercial applications while providing substantial airflow flexibility within each cabinet size.
RT-70 Applications:
- Small to medium retail spaces
- Professional offices and medical buildings
- Restaurant and hospitality applications
- Educational classrooms and small assembly areas
RT-120 Applications:
- Large retail and warehouse spaces
- Corporate offices and conference centers
- Healthcare and laboratory facilities
- Industrial and manufacturing support areas
Future Expansion Plans
More cabinet sizes will be available later this year. This planned expansion will provide additional capacity options to serve larger commercial applications and specialized market segments.
Market Positioning and Competitive Analysis
Strategic Market Entry
Greenheck’s entry into the packaged rooftop unit market represents a significant expansion of the company’s product portfolio. With our product launch in calendar year 2025, we know a mountain of work still stands in front of us. We look forward to product design and testing, building a new manufacturing facility on our Tulsa Campus, installing new manufacturing equipment.
Manufacturing Infrastructure Investment
The establishment of dedicated manufacturing facilities demonstrates Greenheck’s long-term commitment to the rooftop unit market. The Tulsa campus expansion provides manufacturing capacity specifically designed for RTU production while leveraging Greenheck’s established supply chain and quality systems.
Competitive Differentiation
The RT series differentiates itself through:
- Hybrid functionality combining RTU and DOAS capabilities
- Standard features that competitors typically offer as expensive options
- Comprehensive factory testing and programming
- Integrated design eliminating field coordination challenges
Industry Impact and Technology Implications
IAQ Standards Evolution
The RT series launch aligns with evolving indoor air quality standards that emphasize adequate ventilation air delivery. The hybrid design enables compliance with ventilation requirements while maintaining energy efficiency through mixed air operation.
Market Disruption Potential
Traditional market segmentation between rooftop units and dedicated outdoor air systems faces disruption as hybrid solutions demonstrate superior cost-effectiveness and performance in many applications.
Technology Integration Trends
The RT series exemplifies the trend toward comprehensive factory integration, reducing field installation complexity while improving system performance and reliability.
Installation and Service Advantages
Simplified Installation Process
The RT series design minimizes field installation complexity through comprehensive factory assembly and testing. Standard features that typically require field coordination are integrated and tested before shipment.
Installation Benefits:
- Single crane lift for complete system installation
- Factory-tested refrigerant circuits eliminate field charging
- Pre-programmed controls reduce commissioning time
- Integrated electrical panels simplify field connections
Service and Maintenance Accessibility
Component layout prioritizes service accessibility while maintaining compact footprint. Critical components are positioned for routine maintenance without extensive disassembly.
Service Features:
- Removable panels provide access to all serviceable components
- Diagnostic LEDs and displays simplify troubleshooting
- Standard tooling requirements reduce service costs
- Component accessibility reduces maintenance time
Energy Efficiency and Sustainability
Efficiency Performance Metrics
The RT series achieves superior efficiency ratings through the integration of advanced technologies including inverter compressors, EC motors, and intelligent controls. These technologies work synergistically to optimize performance across varying load conditions.
Sustainability Features
The design incorporates multiple sustainability elements:
- High-efficiency operation reduces overall energy consumption
- R-410A refrigerant with lower GWP alternatives under development
- Durable construction extends equipment lifespan
- Factory optimization reduces field waste and commissioning errors
Application Versatility and Market Segments
Commercial Office Applications
The RT series addresses the diverse needs of modern office buildings requiring precise comfort control, energy efficiency, and indoor air quality management. Mixed air capabilities provide adequate ventilation while minimizing energy penalties.
Retail and Hospitality Markets
Variable capacity operation and precise humidity control make the RT series ideal for retail applications where customer comfort and product preservation are critical. Restaurant applications benefit from enhanced ventilation capabilities.
Healthcare and Laboratory Facilities
Modulating exhaust capabilities and precise environmental control support healthcare applications requiring specific air quality and pressurization standards. Laboratory applications benefit from integrated ventilation and conditioning capabilities.
Educational Facilities
Schools and universities require reliable, efficient HVAC systems that support learning environments while minimizing operating costs. The RT series provides comprehensive solution for classroom and assembly applications.
Future Development and Technology Roadmap
Capacity Expansion Plans
Additional cabinet sizes under development will extend the RT series into larger commercial applications, potentially including multi-zone configurations for complex buildings.
Technology Enhancement Opportunities
Future enhancements may include:
- Advanced refrigerants with lower environmental impact
- Enhanced connectivity and IoT integration
- Artificial intelligence-based optimization algorithms
- Expanded heat pump operating ranges for extreme climates
Market Segment Expansion
Success in initial market segments may drive development of specialized variants for unique applications such as cleanrooms, data centers, or process cooling applications.
Economic Analysis and Value Proposition
Total Cost of Ownership Benefits
The RT series provides compelling economic value through:
- Reduced installation costs through factory integration
- Lower energy consumption through advanced technologies
- Simplified maintenance reducing service costs
- Enhanced reliability minimizing downtime expenses
Utility Rebate Opportunities
High-efficiency operation positions the RT series for utility rebate programs supporting commercial energy efficiency initiatives. Program eligibility varies by region but typically includes both demand reduction and energy efficiency components.
Competitive Response and Market Dynamics
Industry Response Expectations
Established rooftop unit manufacturers will likely respond to the RT series through their own hybrid solutions or enhanced traditional offerings. Market acceptance will determine the pace of competitive development.
Technology Adoption Timeline
Commercial market adoption of new technologies typically requires 2-3 years for widespread acceptance. Early adopters will likely include design-build contractors and progressive consulting engineers seeking differentiated solutions.
Training and Support Infrastructure
Contractor Education Programs
Greenheck’s established HVAC University platform provides comprehensive training on RT series installation, commissioning, and service. This educational infrastructure supports successful market adoption.
Technical Support Systems
Comprehensive technical support includes:
- Design assistance for complex applications
- Start-up and commissioning support
- Ongoing technical consultation
- Parts and service support through established network
Conclusion: Redefining Rooftop Unit Standards
The launch of Greenheck’s Model RT series represents more than a product introduction; it signals a fundamental shift in rooftop unit design philosophy that prioritizes hybrid functionality and comprehensive factory integration. By bridging the gap between traditional rooftop units and dedicated outdoor air systems, the RT series addresses the evolving needs of modern commercial buildings requiring enhanced indoor air quality without sacrificing energy efficiency.
The technical innovation demonstrated in the RT series—from inverter scroll compressors to EC condenser fans—establishes new performance benchmarks while maintaining the installation simplicity that makes rooftop units attractive for commercial applications. The comprehensive options portfolio ensures applicability across diverse market segments while future capacity expansion will extend market reach.
For HVACR contractors and consulting engineers, the RT series offers a differentiated solution that can provide competitive advantage through superior performance and simplified installation. Building owners benefit from reduced total cost of ownership through integrated design and advanced efficiency technologies.
The success of the RT series will likely influence broader industry trends toward hybrid solutions and factory integration, potentially accelerating the evolution of commercial HVAC systems. As indoor air quality standards continue evolving and energy efficiency requirements increase, solutions like the RT series that address both challenges simultaneously will become increasingly valuable in the commercial marketplace.