RTU Repair
Compressors, condenser fan motors, contactors, capacitors, control boards and the refrigerant faults behind gradual capacity loss.
- Electrical & Control Faults
- Compressor & Fan Motors
- Refrigerant Diagnosis
- Written Findings
RTU Repair, Replacement & Maintenance
Packaged Rooftop Units
in Longview, TX
Almost every commercial building in East Texas is cooled by a packaged unit sitting on its roof, and almost nobody goes up there. That combination — hard-working equipment in a punishing spot that nobody inspects — produces the most predictable failure list in commercial HVAC.
- RTU Repair & Replacement
- Curb Adapters & Crane Set
- Economizer & Damper Service
- Condensate Drain Maintenance
Napps Commercial HVAC — Longview & East Texas since 1957
What We Do
Rooftop Unit Services
Repair, replacement and the maintenance that decides which of those two you need next. Offices, retail, churches, restaurants and light industrial.
RTU Replacement
Old unit removed, curb adapted to the new footprint, crane set coordinated, roof penetrations properly sealed and the system commissioned.
- Load-Calculated Sizing
- Curb Adapters Fabricated
- Crane Set Coordinated
- Out-of-Hours Scheduling
Condensate & Drainage
Pans, traps, drain lines and overflow switches. The single most common cause of building damage from rooftop equipment in this climate.
- Drain & Trap Clearing
- Overflow Switch Testing
- Pan Corrosion Inspection
- Cause Addressed
Economizers & Controls
Dampers, actuators, linkages and sensors — the free cooling most buildings stopped getting years ago without ever being told.
- Damper & Actuator Service
- Linkage Freed and Set
- Sensors Verified
- Operation Proven
Airflow, Belts & Filters
Blower assemblies, belt tension, filter racks and the static pressure problems that make a healthy unit look faulty.
- Belt & Bearing Service
- Filter Rack Condition
- Static Pressure Measured
- Duct Connections Checked
Scheduled RTU Maintenance
Somebody going up there on a schedule, which is the entire difference between a cheap problem and an expensive one.
- Coil Cleaning
- Drain Clearing
- Electrical Tightening
- Documented Each Visit
Why They Fail
What a Roof Does to Commercial Equipment
Rooftop units fail in a very short list of ways here, and every item on that list is visible in advance to anybody who looks.
The condensate drain is the one that damages the building
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A rooftop unit pulls a remarkable volume of water out of East Texas air, and all of it leaves through one small drain sitting in the sun. Algae, dust and roof debris block it, the pan overflows, and the water finds its way into the building through the curb. The repair is minutes of work. The ceiling grid, insulation and light fittings it ruins first are not. This is the single most common building-damage claim we see from rooftop equipment.
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Loaded condenser coils and the capacity nobody notices leaving
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A condenser coil on a roof collects pollen in spring, cottonwood in early summer and dust year round. As it loads, the unit rejects heat less effectively, runs longer, draws more current and eventually trips on high pressure during the hottest week of the year. Nothing indicates this on a thermostat. It shows up as a slightly warmer building and a slightly higher bill, until it shows up as a failure.
Commercial AC Repair →
Economizers that stopped working and nobody was told
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An economizer uses cool outside air when it is available, which in East Texas is a meaningful part of spring, autumn and winter. Left unserviced, the actuator fails or the linkage seizes and the damper stops moving. Stuck closed, you pay for cooling you could have had free. Stuck open, you pull hot humid August air into the building and pay to remove the moisture. Both are invisible from inside, and both are on almost every unserviced unit we open.
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Access is a real part of the job
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Roof work needs safe access, and how a unit is reached affects both the schedule and the price honestly rather than as an excuse. Ladder access, hatch access, crane positioning and whether a lift can reach the building all matter. We establish this at the assessment so that the quote and the timeline are both real, rather than discovering it on the morning of the work.
Commercial AC Replacement →Rooftop Maintenance Intervals
Guidance for East Texas conditions. Heavy dust or grease loading shortens all of these.
| Task | Typical Interval | Why It Matters Here |
|---|---|---|
| Condensate drain clearing | Quarterly in cooling season | Prevents the fault that damages the building |
| Condenser coil cleaning | Twice yearly minimum | Directly restores lost capacity and efficiency |
| Belt and bearing check | Twice yearly | Rotating parts give notice before failure |
| Economizer operation | Annually, verified moving | Free cooling most buildings have lost |
| Electrical connections | Annually | Loose lugs and worn contactors are cheap to fix early |
| Filter changes | Monthly to quarterly | Static pressure and coil protection |
📅 Call 903-758-6482
Or call 903-758-6482 — 24/7
How It Works
How Rooftop Work Runs
Assessed on the roof, priced in writing, scheduled around your business.
1
Roof Assessment
We go up and inspect the actual unit and its access, including curb condition and drainage.
2
Findings and Price in Writing
What needs attention now, what can wait, and what will need budgeting within a couple of years.
3
Work Scheduled to Suit You
Out of hours where the work would otherwise disrupt trading, with crane and access arranged in advance.
4
Verified and Documented
Performance confirmed, economizer proven to move, drains tested, and the visit written up.
Warning Signs
What a Rooftop Unit Tells You Before It Fails
Almost every rooftop failure we attend gave notice. These are the notices.
Staining on the ceiling below the unit
The condensate pan is overflowing. Every additional day adds building damage to what started as a blocked drain.
The building runs warmer on hot afternoons
Capacity loss, usually a loaded condenser coil. It gets worse, and it completes on the hottest day.
Breakers tripping in the afternoon heat
High head pressure or a failing fan motor. Repeated resetting is how this becomes an electrical fault.
Noise you can hear from below
Belts and bearings. Cheap to attend, expensive to replace after they take a motor with them.
Hot humid air entering during mild weather
A seized economizer damper stuck open, quietly loading your cooling system and your bill.
Cooling costs rising with no change in use
Efficiency decline across coils, dampers and controls. All of it recoverable, none of it visible from inside.
What We Check on Every Rooftop Visit
Condensate pan, trap, line and overflow switch
Because this is the fault that damages the building rather than the equipment.
Condenser and evaporator coil condition
The most recoverable efficiency available on rooftop equipment in this climate.
Economizer dampers and actuators
Proven to actually move, rather than noted as present.
Electrical connections, contactors and capacitors
Tightened and tested. Loose connections on a roof do not improve on their own.
Why Napps?
Why Businesses Trust Napps on the Roof
Somebody who actually goes up there, on a schedule, and writes down what they found.
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Rooftop Equipment Is Daily Work Here It is the dominant commercial equipment in East Texas, and it is what our commercial technicians work on constantly.
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Documented Findings Every Visit What we did, what we found, and what will need budgeting. So replacement is planned rather than survived.
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Scheduled Around Your Trading Nights and weekends where daytime work would cost you more than the job itself.
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Licensed & Insured — TACLA 72668C Texas licensed HVAC contractor working in East Texas since 1957.
TACLA 72668C
NATE Certified
Bryant Factory Authorized
ACCA Member
Since 1957
65+
Years Serving East TX
24/7
Emergency Availability
★ 4.8
From 229 Google Reviews
2
TX Licences — HVAC & Plumbing
📅 Call 903-758-6482
Or call 903-758-6482 — available 24/7
What Longview Says
Real Reviews from Real Napps Customers
4.8 out of 5 · 229 Google reviews
These come straight from our Google Business Profile — unedited, and updated automatically as new reviews come in.
Common Questions
Packaged Rooftop Unit Questions
What facility managers and owners ask about RTUs.
How often should rooftop units be serviced in East Texas?
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Twice a year is the minimum, and in this climate condensate drains and condenser coils frequently justify quarterly attention through the cooling season. Buildings with heavy dust, grease or vegetation loading need more again. The interval should follow what is actually on your roof rather than a standard package.
Why does water leak into the ceiling below our rooftop unit?
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It is almost always a blocked condensate drain rather than a roof leak. The unit removes a great deal of moisture from East Texas air and it all exits through one small line that collects algae and debris on a hot roof. When it blocks, the pan overflows and the water enters through the curb. Clearing it is quick. The damage it does first is not, which is why it is worth attending immediately.
What is an economizer and does ours work?
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It is a damper assembly that brings in cool outside air when conditions allow, giving you cooling without running the compressors. On units that have not been serviced, the actuators and linkages commonly seize, and it stops working without any indication inside the building. We verify that the damper actually moves rather than simply recording that one is fitted.
Can a rooftop unit be replaced without replacing the roof curb?
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Usually, yes. Where the new unit footprint differs from the old one, a curb adapter is fabricated and fitted, which is far less disruptive than reworking the roof opening. Done properly and correctly sealed it is a permanent solution; done badly it becomes a roof leak that gets blamed on the roofer for years.
How long do packaged rooftop units last here?
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Fifteen to twenty years is a reasonable expectation with genuine maintenance, and ten to twelve is common without it. The gap between those two numbers is almost entirely coil cleaning, drain clearing and electrical attention — inexpensive work that simply requires somebody to go up there.
Do you service rooftop units another contractor installed?
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Routinely. Most of the rooftop equipment we maintain was fitted by somebody else. We start with a proper condition assessment so you get an honest baseline rather than inheriting the previous contractor assumptions.
Repair, replacement and the wider commercial offering.
Rooftop Unit Trouble? Call 903-758-6482.
We go up, inspect properly, write down what we found, and price it before starting.
Get In Touch
Request Rooftop Unit Service
Tell us roughly how many units are on the building and what you are seeing. Ceiling staining should be treated as urgent.
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24/7 Emergency Line 903-758-6482
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Office Location 1003 West Cotton St., Longview, TX 75604
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Emergency Service Available 24 hours a day, 7 days a week
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Financing Available Financing available on rooftop unit replacement