Commercial Rooftop HVAC Maintenance in Pflugerville, TX: Reading the 25-Degree Temperature Split

August 3, 2026 — Pflugerville, TX

Most preventative maintenance reports end with three words: “operating properly.” That is a claim, not a measurement. On a scheduled rooftop maintenance visit at a Pflugerville quick-service restaurant, the visit ended with a number instead — a verified 25°F temperature split across the evaporator, taken after the work was finished and with refrigerant pressures logged alongside it. That number is what separates a PM that was performed from a PM that was proven.

What a Temperature Split Actually Tells You

The temperature split is the difference between the air going into the return and the air coming out of the supply. On a properly charged, properly breathing packaged unit in cooling, that gap generally lands somewhere in the high teens to mid twenties, depending on indoor humidity and load. It is a single reading, but almost every common rooftop failure shows up in it.

• Split too narrow — often low charge, a struggling compressor, or a coil that is not absorbing heat
• Split too wide — usually starved airflow: loaded filters, a dirty blower wheel, a slipping belt
• Split that drifts during the run — frequently a coil beginning to ice, or condenser-side heat rejection falling off

A 25°F split with normal R-410A operating pressures, measured together, is a much stronger statement than either reading alone. Pressure confirms the refrigerant side is behaving. Split confirms the air side is moving what the equipment was designed to move. Both good, at the same time, on the same unit, is the closest thing to a receipt a rooftop maintenance visit can produce.

What It Took to Get There

The unit — a packaged rooftop system, Trane equipment serviced under our standard commercial maintenance scope — did not start the visit anywhere near that number. The evaporator coil was heavily impacted with dirt and debris, the kind of loading that chokes return air long before anyone in the dining room notices the space feels off.

The work performed on this visit:

• Thoroughly cleaned both the evaporator and condenser coils to restore airflow and heat transfer
• Replaced two 20″ × 30″ × 2″ air filters found excessively contaminated
• Replaced a failed 7.5 µF condenser fan motor run capacitor
• Inspected the blower drive belt, verified proper tension, and documented the unit as running an AX26 belt
• Cleaned the unit cabinet and accessible interior components
• Performed final operational testing, verifying a 25°F temperature split with normal R-410A pressures

The failed run capacitor is worth pausing on. A condenser fan motor with a dead or weakened run capacitor is one of the most common reasons a rooftop unit drops offline in a Central Texas August — the fan slows or stalls, head pressure climbs, and the unit trips on high pressure at exactly the hour the building is fullest. Caught on a scheduled visit in the shade of a maintenance appointment, it is a part swap measured in minutes.

Rooftop unit struggling to hold temperature? Call 512-992-5537. Setpoint Services runs 24/7 emergency service across Austin, Pflugerville, and the surrounding area, and we will get a technician on the roof fast.

Why the Belt Part Number Belongs on the Report

Documenting the AX26 belt is a small detail that pays off on the next call. When a belt fails on a Friday night, the difference between a same-visit fix and a return trip is whether the correct belt is already on the truck. A maintenance file that records belt size, filter dimensions, and capacitor ratings turns future service calls into one-visit repairs instead of two.

The same logic applies to the filters. Two 20″ × 30″ × 2″ filters is a specification, not a guess — and a unit fitted with the wrong size or the wrong depth will bypass air around the media no matter how often the filters get changed. Recording it once means it stays right.

Where Rooftop Maintenance Pays for Itself

For restaurants, retail, convenience stores, and food service operations, a rooftop unit is not a comfort system — it is a revenue system. Dining rooms empty out when the space climbs into the 80s, and a shutdown during a lunch rush costs more than a year of scheduled service. Regular preventative maintenance keeps the equipment running at the efficiency it was designed for, catches wear items like capacitors and belts before they strand a unit, and gives you a documented equipment history. When something does break, our commercial HVAC repair team is already familiar with what is on your roof, and our installation team can advise when a unit has reached the end of a sensible repair curve.

Setpoint Services is a Texas-licensed commercial refrigeration and HVAC contractor (TACLA00116720C) based in Pflugerville. On the HVAC side we are factory authorized for Daikin, Goodman, Carrier, and York, and we service every major brand of rooftop, split, and packaged equipment across the Austin Area — alongside walk-in cooler and commercial ice machine service for operators who would rather work with one contractor than three.

Commercial Rooftop HVAC Service Across the Austin Area

Call 512-992-5537 to schedule preventative maintenance or request service, or reach us through our contact page. We respond across Austin, Pflugerville, Round Rock, Georgetown, Cedar Park, Leander, Hutto, Taylor, Kyle, Buda, Jarrell, Temple, Belton — and surrounding Austin Area communities.

Setpoint Services — commercial refrigeration and HVAC for the Austin Area.