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Rooftop Units

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Rooftop Units: Reliable Commercial HVAC Solutions

Rooftop units, commonly referred to as RTUs, represent one of the most widely used commercial HVAC systems in the United States. These self-contained systems sit atop commercial buildings and handle heating, cooling, and ventilation through a single, integrated package. At Hubbs Heating & Air, we provide comprehensive HVAC solutions, from installation and repair to maintenance and energy-efficient upgrades, ensuring your comfort and peace of mind. As a hometown company that is family-owned and women-owned, we take pride in delivering expert service on rooftop units across a wide range of commercial applications.

According to the Department of Energy, rooftop units account for roughly 60 percent of the commercial building cooling capacity in the United States. Their popularity stems from a combination of practical advantages: they conserve valuable interior floor space, simplify installation logistics, and provide centralized climate control that can serve entire buildings or designated zones. Whether you operate a retail store, warehouse, office complex, or restaurant, an RTU is likely the backbone of your indoor comfort system.

How Rooftop HVAC Units Work

A rooftop unit functions as a packaged system, meaning all major components are housed within a single cabinet. This includes the compressor, condenser coil, evaporator coil, fans, filters, and often a gas furnace or electric heating element. Conditioned air is distributed through ductwork that connects to the building below via roof curbs or adapters. Return air is pulled back up to the unit, filtered, mixed with fresh outdoor air for ventilation, and then reconditioned before being sent back into the occupied space.

Modern RTUs incorporate advanced controls including variable-speed fans, modulating gas valves, and economizer systems. Economizers are particularly valuable because they use cool outdoor air for free cooling when ambient temperatures are favorable, dramatically reducing compressor runtime and energy consumption. Many newer units also feature demand-controlled ventilation using CO2 sensors, which adjust the amount of fresh air intake based on actual occupancy levels rather than fixed rates. These technologies can reduce energy consumption by 20 to 40 percent compared to older, single-stage equipment.

Applications Across Industries

Rooftop units serve an incredibly diverse range of commercial environments. In retail settings, RTUs maintain consistent temperatures across large open floor plans, keeping customers comfortable and protecting temperature-sensitive merchandise. Restaurants rely on RTUs not only for climate control but also for managing the significant heat loads generated by commercial kitchens. Office buildings use zoned RTU systems to allow different tenants or departments to maintain individual temperature preferences without affecting neighboring spaces.

Industrial and warehouse applications present unique challenges that rooftop units handle effectively. Large distribution centers may require multiple RTUs working in concert to maintain acceptable conditions across hundreds of thousands of square feet. Medical offices and dental practices depend on precise temperature and humidity control that properly sized and configured RTUs deliver consistently. Our expert technicians are available 24/7 to deliver fast, reliable service, including same-day responses and free estimates, no matter what type of commercial facility you operate.

Rooftop HVAC Installation, Maintenance, and Repair

Proper installation of a rooftop unit requires careful consideration of several critical factors. Load calculations must account for building size, insulation levels, occupancy, equipment heat loads, and local climate data. The roof structure must support the unit’s weight, and curb adapters need to be properly sealed to prevent leaks. Ductwork design directly impacts system efficiency and comfort, making professional installation essential for long-term performance. We handle every aspect of RTU installation to guarantee quality workmanship and customer satisfaction.

Routine maintenance is equally important for maximizing the lifespan and efficiency of your rooftop unit. A well-maintained RTU can operate effectively for 15 to 20 years, while neglected units often fail prematurely and consume significantly more energy. Our maintenance services address every critical component:

  • Filter replacement and inspection to maintain proper airflow and indoor air quality
  • Coil cleaning to preserve heat transfer efficiency and prevent corrosion
  • Belt and bearing inspection to avoid unexpected fan motor failures
  • Refrigerant charge verification to ensure optimal cooling performance
  • Electrical connection tightening to prevent arc faults and component damage
  • Economizer calibration to maximize free cooling opportunities
  • Thermostat and control testing to verify accurate temperature regulation

When repairs are needed, we provide same day service to minimize downtime for your business. Whether it’s a failed compressor, a malfunctioning economizer damper, a refrigerant leak, or a faulty ignitor, our technicians diagnose issues quickly and carry common replacement parts to resolve problems efficiently.

Energy Efficiency and Future Trends

The rooftop unit market is evolving rapidly toward higher efficiency standards and smarter controls. The Department of Energy has progressively tightened minimum efficiency requirements, and many building owners are choosing units that exceed these minimums to capture utility rebates and reduce operating costs. Variable refrigerant flow technology, heat pump RTUs, and units compatible with building automation systems represent the future of commercial rooftop HVAC. Whether it’s heating, cooling, or ventilation, choose Hubbs Heating & Air for efficient, hassle-free service that keeps your business running smoothly.