Rooftop Units or Split Systems Which is the Best Choice for Commercial Buildings
- Matthew Morey
- 2 days ago
- 3 min read
At Zoltera Mechanical Ltd, one of the most common design questions we help commercial clients answer is: "What is the best option for my building?"
Simply put, there is no universal "best" option. The right choice depends on building type, budget, long-term plans, and maintenance. This article breaks down the difference between commercial Rooftop Units (RTU's) and split systems for Kelowna residents.
Understanding Commercial Rooftop Units
Rooftop units are self-contained HVAC systems installed on the roof of a building. They combine heating, cooling, and ventilation components in one package. RTUs are popular for commercial buildings because they save indoor space and simplify ductwork.
Advantages of Rooftop Units
Space-saving: Since RTUs sit on the roof, they free up valuable indoor space for other uses.
Ease of installation: Installing an RTU usually requires less disruption inside the building because ductwork runs from the roof downward.
Centralized control: One unit can serve large areas or multiple zones, making it easier to manage climate control.
Durability: RTUs are designed to withstand outdoor conditions, often with weather-resistant materials.
Challenges with Rooftop Units
Maintenance access: Technicians need roof access, which can be difficult or unsafe in some buildings.
Energy efficiency: RTUs may lose efficiency due to exposure to outdoor temperatures, especially in extreme climates.
Initial cost: The upfront cost can be higher due to the need for roof reinforcement and specialized installation.
Exploring Split Systems
Split systems consist of two main parts: an outdoor condenser and an indoor air handler. These components connect through refrigerant lines and electrical wiring. Split systems are common in smaller commercial spaces or buildings without roof access.
Advantages of Split Systems
Flexible installation: The indoor and outdoor units can be placed separately, allowing for more design options.
Energy efficiency: Split systems often provide better energy performance because the indoor unit is protected from outdoor temperature swings.
Easier maintenance: Indoor units are more accessible for routine checks and repairs.
Lower noise levels: Since the compressor is outside, indoor noise is reduced.
Challenges with Split Systems
Space requirements: Indoor units require wall or ceiling space, which may limit layout options.
Complex ductwork: Multiple split systems may be needed for larger buildings, increasing installation complexity.
Higher installation labor: Running refrigerant lines and wiring between units can be labor-intensive.
Which System Is Best For Your Building?
Rooftop Units Are Often Best When:
Roof structure can support equipment
Building has large open zones
Budget is a concern
Simple replacements
Split Systems Are Often Best When:
Zoning and comfort control are critical
Building has various tenants
Roof space is limited
Long-term flexibility is required
In many commercial properties, a hybrid approach is also possible!
Practical Considerations for Decision Making
When deciding between rooftop units and split systems, consider these factors:
Building structure and roof condition: Can the roof support heavy equipment?
Climate and weather exposure: Will outdoor units face extreme temperatures or weather?
Maintenance capabilities: Is there safe and easy access for technicians?
Budget constraints: What are the upfront and long-term costs?
Energy goals: Is energy efficiency a priority for sustainability or cost savings?
Final Thoughts on Choosing the Right HVAC System
Zoltera Mechanical helps commercial clients select the correct systems that perform reliably, not just today but for decades. Contact us today for a free estimate, and site assessment!
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