RTU Replacements

When a rooftop unit fails on a hot afternoon, the cost is not only measured in comfort. Sales floors empty, employees lose focus, and refrigerated stock can be put at risk. A rooftop unit, commonly called an RTU, is the workhorse of many commercial and light commercial buildings, and when it reaches the end of its service life, planning a replacement carefully makes the difference between a smooth transition and a disruptive one. At Bill Joplin's Air Conditioning & Heating, we manage RTU replacements from the first load assessment through final startup, so the new equipment fits your building and your budget.

Why RTU Replacement Deserves Careful Planning

A rooftop unit combines the compressor, condenser, evaporator, blower, and often the heating section into a single packaged cabinet installed on the roof. Because everything sits in one place, an aging RTU that begins to fail can take down both heating and cooling at the same time. Repeated compressor faults, failing heat exchangers, and rusted cabinets are all signs that repair dollars are no longer a wise investment.

Replacing an RTU is different from swapping a residential split system. The unit must match the existing roof curb, the electrical service, and the ductwork already in place. It also has to meet the current load of the building, which may have changed as the space was remodeled or repurposed over the years. Founded in 1978, Bill Joplin's Air Conditioning & Heating has watched buildings across our service area change hands and change uses, and we plan every replacement around how the space is actually used today.

Common Questions Building Owners Ask

Many owners want to know whether they truly need a full replacement or whether one more season of repairs will get them by. We answer that honestly. If the compressor and heat exchanger are still sound and parts remain available, a targeted repair can be the right call. But when the unit is past 15 years, when refrigerant is an obsolete type, or when repair costs approach the value of a new unit, replacement is the practical choice.

Another frequent question concerns downtime. Business owners worry that a rooftop swap will close their doors for days. In most cases, a well-coordinated crane lift and changeout is completed in a single day, and we schedule the work to fit around your operating hours whenever the calendar allows. A third common concern is sizing. An oversized unit short-cycles and wastes energy, while an undersized one runs constantly and never satisfies the space. We calculate the correct capacity before we ever recommend a model.

How We Approach an RTU Replacement

Our methodology follows a consistent sequence so nothing is overlooked. We begin at the roof and end with a documented startup, and each step feeds the next.

1. Site survey and load calculation: We measure the conditioned space, check insulation and window loads, and confirm the true cooling and heating demand rather than simply matching the old nameplate.
2. Curb and duct inspection: We verify the existing roof curb dimensions and the condition of the supply and return ductwork, noting any adapter curb that may be required for a new footprint.
3. Electrical and gas verification: We confirm that the available voltage, breaker size, and gas supply match the new unit, and we flag any upgrades needed for code compliance.
4. Equipment selection: We present efficiency options, staging choices, and control compatibility so you understand what each level of investment delivers.
5. Removal and installation: A crane lifts the old unit clear, we set the new RTU on the curb with a proper seal, connect utilities and controls, and secure all penetrations against weather.
6. Startup and commissioning: We check refrigerant charge, airflow, temperature split, and safety controls, then document the readings for your records.

This progression keeps surprises off the roof and out of your budget. By confirming the curb, ductwork, and utilities before the equipment arrives, we avoid the delays that occur when a new unit does not match what is already there.

Technical Specifications That Matter

Modern rooftop units offer meaningful improvements over equipment installed a decade or more ago. Understanding a few key specifications helps you choose wisely. Efficiency is rated in SEER2 for cooling and, for gas heat sections, in AFUE and input BTU. Higher-staged compressors and variable-speed blowers hold temperatures more steadily and reduce the sharp swings common with older single-stage units.

Airflow is measured in CFM, and matching the blower output to your duct system prevents pressure problems that shorten equipment life. Refrigerant type also matters, since newer units use current refrigerants that will remain serviceable for years to come. Economizers, which pull in cool outside air when conditions allow, can cut cooling costs during mild weather and are a feature worth discussing during selection. Control compatibility rounds out the list, because a new RTU should integrate cleanly with your existing thermostat or building management system.

Where RTU Replacements Make a Difference

Rooftop units serve a wide range of buildings, and each type brings its own priorities. We tailor the replacement to the way the space is used rather than applying a single formula.

• Retail storefronts: Steady comfort near entry doors keeps shoppers browsing, and quieter variable-speed units reduce distraction on the sales floor.
• Restaurants: Kitchens generate heavy heat and demand strong, reliable cooling paired with proper make-up air balance.
• Medical and professional offices: Precise temperature control and quiet operation support patient comfort and staff productivity.
• Warehouses and light industrial spaces: Durable units with straightforward controls handle large volumes and long run times.
• Churches and community buildings: Spaces that fill quickly benefit from equipment sized to handle sudden occupancy changes.

Across each of these settings, the goal is the same: reliable comfort, predictable energy use, and equipment that lasts. When we plan a replacement for a busy restaurant, for example, we account for the extra heat load of cooking equipment and the airflow needed to keep the dining area comfortable while the kitchen runs hot. In a medical office, we prioritize quiet operation and tight temperature control so exam rooms stay consistent throughout the day.

Serving McKinney and the Surrounding Communities

As a leading residential HVAC contractor, Bill Joplin's Air Conditioning & Heating provides heating and cooling services to McKinney, TX, and the surrounding communities, including Mckinney, Allen, Melissa, Prosper, Fairview, Lucas, Plano, and Princeton, TX. Our long history in this region means we understand the local climate demands, the building stock, and the seasonal swings that put rooftop equipment to the test. That experience shapes every recommendation we make, from the capacity we specify to the efficiency level we suggest.

Beyond RTU replacements, our team handles HVAC repair, heater repair, AC installation, furnace repair, and AC repair, so the same crew that installs your new rooftop unit can maintain it for years afterward. Regular maintenance protects the investment you make in new equipment, and staying with a single contractor keeps a complete service history in one place. When the time comes to plan an RTU replacement for your building, reach out to Bill Joplin's Air Conditioning & Heating and let our team walk the roof, run the numbers, and give you a clear path forward built on decades of hands-on experience.