Rooftop Unit (RTU) Service
Expert rooftop unit (RTU) repair, replacement, and maintenance in Nashville. All tonnages and brands. 24/7 emergency service. Economizer repair, compressor replacement.
Nashville's Rooftop Unit Specialists
Rooftop units are the workhorses of commercial HVAC in Nashville. From strip malls and restaurants to office buildings and warehouses, RTUs provide heating and cooling for a huge portion of Middle Tennessee's commercial building stock. These units sit on the roof exposed to Nashville's intense sun, driving rain, ice storms, and summer heat, all while running thousands of hours per year to keep your building comfortable.
Harpeth Air specializes in rooftop unit service, repair, replacement, and maintenance across Nashville and Middle Tennessee. Our technicians work on RTUs every day and understand the specific failure patterns, maintenance requirements, and operational nuances of these units in our local climate. Whether your 5-ton unit on a retail store needs a new compressor or your 80-ton unit on a warehouse needs a complete economizer overhaul, we have the expertise and equipment to handle it.
We service all brands, all tonnages, and all configurations of rooftop units. Gas/electric, heat pump, dual fuel, constant volume, variable air volume. If it sits on a commercial roof in Nashville, we can fix it, maintain it, or replace it.
RTU Services We Provide
RTU Repair
From failed compressors and blown capacitors to malfunctioning economizers and control board failures, we diagnose and repair all RTU problems. Our trucks carry the most common RTU parts to minimize downtime. For major component failures, we source parts quickly through our distributor network.
RTU Replacement
When repair no longer makes financial sense, we manage the complete replacement process including equipment selection, structural evaluation, curb adaptation, crane coordination, electrical connections, controls integration, and commissioning. We often complete straightforward RTU changeouts in a single day.
RTU Maintenance
Regular RTU maintenance is essential for reliable performance and maximum equipment life. Our RTU maintenance includes filter changes, coil cleaning, belt inspection, electrical testing, refrigerant verification, economizer calibration, gas system inspection, and comprehensive operational testing.
Economizer Service
Economizers save significant energy by using free outdoor air cooling when conditions permit. However, they are one of the most commonly malfunctioning components on RTUs. We repair and calibrate economizers, replace damper motors and sensors, and verify proper operation to ensure you are getting the energy savings these systems are designed to deliver.
On the Roof, In Your Corner
Our technicians work on rooftop units every day. That frequency translates to faster, more accurate diagnosis — we know the common failure points for each brand, the typical symptoms of each failure mode, and the most efficient repair path.
Every rooftop visit starts with a thorough safety check. We carry OSHA-compliant fall protection, coordinate with facility managers on access, and leave the roof membrane in better shape than we found it.
Common RTU Problems in Nashville
Nashville's climate is particularly tough on rooftop units. The combination of extreme summer heat, high humidity, winter freezing, and allergens like pollen and cottonwood seeds creates a challenging operating environment. Here are the most common RTU problems we encounter in Nashville.
Compressor failures from dirty condenser coils and resulting high head pressure
Regular coil cleaning and maintenance prevent this expensive failure.
Economizer dampers stuck open or closed, wasting energy and causing comfort issues
Annual economizer calibration and component replacement as needed.
Condensate drain blockages causing water leaks into the building
Drain cleaning and pan treatment during every maintenance visit.
Gas valve and ignition failures in heating season
Fall maintenance with combustion analysis and ignition system testing.
Belt wear and failure causing loss of airflow
Belt inspection and replacement included in every maintenance visit.
Why choose Harpeth Air for rooftop unit service
RTU service is our bread and butter. Our technicians work on rooftop units more than any other type of equipment, and that frequency of experience translates to faster, more accurate diagnosis and repair. We know the common failure points for each brand, the typical symptoms of each type of failure, and the most efficient repair approaches.
We also understand the logistics of RTU work. We have crane relationships for replacements, we carry roof safety equipment, and we coordinate access and scheduling to minimize disruption to your business. When you need RTU service in Nashville, Harpeth Air gets the job done right and gets it done efficiently.
Frequently Asked Questions
How long do commercial rooftop units last?
A well-maintained commercial rooftop unit typically lasts 15-20 years in Nashville. Units that receive regular preventive maintenance, including coil cleaning, filter changes, belt replacement, and electrical connection maintenance, last significantly longer than neglected units. Nashville climate factors like humidity, heat, and seasonal pollen can shorten RTU life if not managed through proper maintenance.
When should I replace my RTU instead of repairing it?
We generally recommend considering replacement when repair costs exceed 40-50% of replacement cost, the unit is more than 15 years old and experiencing frequent failures, the unit uses R-22 refrigerant (phased out), or energy costs have increased significantly due to declining efficiency. We provide repair vs. replacement cost analysis to help you make an informed decision.
Can you replace my RTU with a higher-efficiency model?
Yes. Modern RTUs are significantly more efficient than units manufactured even 10 years ago. We help you evaluate the ROI of higher-efficiency models by comparing energy savings to the additional equipment cost. In many cases, the energy savings from a high-efficiency RTU pay for the premium over a standard unit within 3-5 years.
Do you service RTUs from all manufacturers?
We service rooftop units from all major manufacturers including Carrier, Trane, Lennox, York, Rheem, Ruud, Daikin, Aaon, and others. Our technicians are experienced with units from 2 tons to 100+ tons in gas/electric, heat pump, and dual-fuel configurations.
Need Rooftop Unit (RTU) Service in Nashville?
Harpeth Air is Nashville's commercial HVAC partner. Call us today or schedule service online.