Rooftop package units dominate commercial buildings across Dallas-Fort Worth. These self-contained systems are mounted on roofs and combine heating and cooling components in a single cabinet. They’re cost-effective, easy to zone, and simple to replace when they wear out. But they also face harsh conditions, direct sun exposure, extreme temperature swings, hailstorms, and dust accumulation that accelerates wear on components.
Our technicians service rooftop units daily across the Metroplex. Office buildings in Plano typically run multiple 3-ton to 10-ton units, one per zone. Retail centers along the Dallas North Tollway might have a dozen units ranging from 5 tons to 25 tons. Warehouses near DFW Airport often use larger 30-ton to 50-ton units that condition vast open spaces. Each building type presents different service challenges.
Common RTU problems include compressor failures from Texas heat, economizer dampers stuck from lack of use, control board issues from power surges, blower motor failures from bearing wear, refrigerant leaks from vibration and age, and gas valve problems on heating sections. Most failures occur during peak demand: July afternoons when temperatures reach 100 degrees or January mornings when overnight temperatures drop below freezing.
We carry replacement parts for Carrier, Trane, Lennox, York, Goodman, and Rheem rooftop units. Our service vans stock compressors, fan motors, capacitors, contactors, control boards, gas valves, and ignitors for the most common commercial RTU models. This means we complete most repairs on the first visit, rather than ordering parts and returning days later. For comprehensive cooling system work beyond rooftop units, we also provide full commercial AC repair services. When replacement makes more sense than repair, our team handles AC installation for all types of commercial cooling systems.
A failed rooftop unit affects everyone in that zone immediately. Office workers complain when temperatures rise above 80 degrees. Retail customers leave uncomfortable stores. Warehouse operations slow down in extreme heat. The longer the unit remains down, the worse the internal conditions become.
We dispatch technicians to Dallas, Fort Worth, Plano, Irving, Frisco, Richardson, and surrounding cities based on their location, not from a single central location. This means faster response times whether you call about an RTU failure at a Richardson office park or a Garland warehouse. Our techs carry diagnostic equipment, manifold gauges for refrigerant testing, multimeters for electrical troubleshooting, digital thermometers for airflow verification, and amp meters for motor load testing.
Troubleshooting rooftop units requires systematic approach. A unit that won’t start might have tripped breakers, failed contactors, bad transformers, or control board problems. A unit that runs but doesn’t cool could have refrigerant leaks, failed compressors, dirty condenser coils, or frozen evaporators. A unit that short-cycles might have oversized equipment, low refrigerant charge, dirty filters, or failing controls. We test components methodically instead of guessing at solutions.
Summer RTU failures often trace back to compressor problems, refrigerant loss, or condenser fan issues. Winter heating failures typically involve gas valves, ignitors, or flame sensors. Spring and fall problems frequently relate to economizer dampers that haven’t moved in months and now stick in one position. For urgent situations requiring immediate attention, our emergency repair team responds 24/7 to get your rooftop units back online fast.
Rooftop units typically last 15 to 20 years with proper maintenance, but many fail earlier from neglect. Texas weather accelerates wear. Direct sun exposure ages components faster. Dust clogs coils and reduces efficiency. Lack of maintenance leads to small problems becoming expensive failures.
Regular RTU service includes filter changes, coil cleaning, refrigerant charge verification, electrical connection tightening, belt inspection and adjustment, blower motor lubrication, economizer damper testing, control calibration, gas pressure verification, and condensate drain cleaning. These tasks prevent most common failures and keep units running efficiently.
Coil cleaning especially matters in Texas. Dust buildup on condenser coils reduces airflow and forces compressors to work harder. A dirty coil can increase energy consumption by 30% and shorten compressor life significantly. We pressure wash coils annually to restore factory airflow rates.
Economizer dampers save energy by bringing in cool outdoor air instead of running compressors when temperatures drop. But dampers stick due to disuse and require periodic exercise and lubrication. A stuck damper wastes energy by running the compressor when free cooling is available, or by bringing in hot outdoor air when the building needs mechanical cooling.
Property managers who schedule preventive maintenance experience fewer emergency calls, lower energy bills, and longer equipment life. We recommend RTU service twice yearly, spring before the cooling season starts, and fall before the heating season begins. This schedule identifies issues during moderate weather, when repairs cause minimal disruption.
TTI, Inc. Testimonial
Emergency RTU repairs cost more than scheduled maintenance. A compressor that fails on Saturday afternoon requires overtime labor and rush parts delivery. The same failure caught during a routine inspection gets fixed during business hours at standard rates with parts ordered normally.
Our maintenance contracts include comprehensive rooftop unit inspections. Technicians access all units safely using proper roof ladders and fall protection equipment. They remove panels to inspect internal components, not just check controls from outside the unit. Visual inspections catch rust, corrosion, loose wiring, refrigerant stains, and component wear before failures occur.
Electrical components degrade over time. Contactors develop pitted contacts that cause arcing. Capacitors lose capacitance and fail to start motors. Wire connections loosen due to vibration and become high-resistance. Control boards develop cold solder joints from temperature cycling. These problems appear gradually, giving maintenance technicians time to schedule repairs before complete failures happen.
Refrigerant leaks typically develop slowly. Small leaks lose a few ounces per year, causing a gradual performance decline that property managers might not notice immediately. Annual refrigerant checks catch these leaks early when repairs are simple, such as tightening a valve core or replacing a Schrader valve. Ignored leaks eventually empty systems completely, requiring expensive leak detection, repairs, evacuation, and full recharge.
Most commercial properties in Dallas, Plano, Irving, Richardson, Fort Worth, and Frisco have maintenance agreements that cover all rooftop units. Multi-building portfolios, in particular, benefit from consolidated contracts with scheduled service dates, predictable costs, and priority response when urgent repairs are required despite regular maintenance.
Rooftop package units are the most common commercial HVAC solution throughout the Metroplex because they’re cost-effective, reliable, and easy to service. One-story office buildings, retail centers, medical offices, restaurants, and light industrial facilities almost universally use RTUs rather than central plant systems.
We service rooftop units on buildings throughout Dallas County, Collin County, Tarrant County, and Denton County. Our technicians work on units in North Dallas office parks, Plano corporate campuses, Richardson tech facilities, Irving retail centers, Fort Worth industrial buildings, Frisco mixed-use developments, and everywhere in between.
Building heights vary from single-story retail stores with units 12 feet off the ground to three-story office buildings with units 40 feet up. We carry appropriate ladders, safety equipment, and access tools for all building types. Some properties have roof hatches for interior access. Others require external ladders. A few need bucket trucks or cranes for heavy equipment replacement. We plan access before starting work to avoid delays and safety issues.
Contact us at (214) 831-5551 for rooftop unit service anywhere in the Dallas-Fort Worth area. Whether you need emergency repairs, scheduled maintenance, or complete RTU replacement, our team brings the experience and equipment to handle projects of any size across the Metroplex.
