Rooftop Unit Repair & Service for Texas Commercial Buildings
When a rooftop unit fails in the middle of a workday, your entire building’s comfort—and operations—stop. At LMH Services, we understand the urgency of commercial HVAC breakdowns. Our technicians service all makes of rooftop units (RTUs) across the Houston metro area, diagnosing problems quickly, restoring airflow reliably, and keeping your tenants and employees productive.
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Why Texas Businesses Trust LMH for Rooftop HVAC
Fast Response to Emergency Outages
We know that rooftop unit breakdowns cost you money every minute they’re down. A non-functioning RTU means your tenants are uncomfortable, your employees are less productive, and in extreme heat, you’re looking at potential liability. We prioritize commercial calls and respond the same day for emergency repair requests across the Houston area. Our fleet is positioned to reach most locations within 30–45 minutes of dispatch, and we keep common RTU parts in our trucks to minimize your downtime.
Certified for All Major RTU Brands
Our technicians are trained and equipped to work on Carrier, Trane, Lennox, York, Ruud, and other commercial equipment. We don’t refuse a unit because of the brand—we fix what you have. Each technician carries multi-brand diagnostic tools and reference materials, so whether your rooftop carries a legacy Trane unit or a newer Lennox, we diagnose quickly and accurately.
Authorized Dealer Status
We hold advanced manufacturer credentials as an Armstrong Air Pro Team dealer and a Generac and Champion authorized dealer, reinforcing our expertise in refrigeration, controls, and commercial-grade HVAC systems. This dealer status means you’re working with factory-trained technicians who understand not just how to repair equipment, but how to specify replacements that will outlast the typical equipment lifecycle. When you need a new rooftop unit, our dealer status often qualifies you for better warranty terms and product pricing.
15+ Years of Commercial HVAC Experience
We’ve maintained rooftop units through Texas summers, diagnosed compressor failures on multi-tenant buildings, and coordinated upgrades around occupied spaces without disrupting tenant operations. That experience translates to faster diagnosis and fewer surprises. We’ve seen the wear patterns that signal failure weeks before catastrophic breakdown, and we know exactly how to test for them.
Comprehensive Electrical Expertise
RTU repair often requires electrical troubleshooting—contactor failure, capacitor replacement, control board diagnostics, thermostat wiring, and emergency shutdown interlock testing. Our team includes licensed electricians trained on commercial HVAC controls, so we handle the whole system. This integrated expertise means you’re not coordinating between an HVAC tech and an electrician—we handle both trades, which speeds up diagnosis and repair.
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How We Service Your Rooftop Unit
From rapid diagnosis to load testing, every step is documented and done to commercial standards — so your building stays comfortable and operational.
We arrive with a complete toolkit for RTU evaluation. Our technician checks airflow, measures refrigerant pressure, tests electrical circuits, and scans the control board for fault codes. This diagnostic step usually takes 30–60 minutes and pinpoints the exact failure point. We’re looking at three dimensions: mechanical (compressor, motors, coils), electrical (contactors, capacitors, control boards), and refrigerant (pressure, charge level, leak locations).
- Check compressor amp draw using a clamp meter (indicates motor strain, bearing wear, or electrical imbalance that signals imminent failure)
- Measure condenser coil temperature differential with infrared thermometer (detects blockage, refrigerant undercharge, or compressor wear)
- Test all electrical contactors, capacitors, and fan motors with a multimeter (capacitor failure is one of the most common RTU issues, often repairable in under an hour)
- Review service history from your building management records to identify patterns (a unit with recurring refrigerant leaks needs a coil replacement, not another charge)
- Document any unusual noise, vibration, or smell from the unit that might indicate bearing failure, contaminated refrigerant, or motor burnout
Once we’ve diagnosed the issue, we call you with a clear explanation: what’s wrong, what repair it needs, what it will cost, and how long it will take. No surprises, no pressure to replace if repair makes sense. We’ll also let you know if this unit is aging and if replacement might be more cost-effective long-term.
- Present the repair scope in writing, with parts and labor itemized
- Discuss warranty on parts and labor (typically 1 year on repairs)
- Explain preventive steps to extend the unit’s lifespan
- Offer emergency after-hours service rates if the job must happen tonight
Our licensed technicians perform the repair using factory-approved parts and methods. We handle refrigerant recovery and recharge according to EPA 608 certification standards. If the unit is at end-of-life, we’ll discuss replacement options and financing.
- Use OEM (original equipment manufacturer) parts where critical
- Evacuate and recharge refrigerant to exact system specifications
- Test all safety interlocks, thermostat connections, and backup controls
- Document the repair with photos and a detailed service ticket for your records
Before we leave your roof, we run the unit under full load (or simulated load if outside conditions don’t cooperate). We verify temperature, pressure, electrical draw, and fan operation. You’ll see the proof that it’s working and that the repair will hold. Load testing is critical for commercial equipment because a repair that looks good at idle might fail under peak building demand.
- Run a 15–20 minute cooling cycle to confirm steady operation across the full cooling load
- Measure indoor temperature drop at the main return air and multiple supply vents
- Monitor refrigerant pressure and superheat throughout the cycle to catch any subtle imbalances
- Listen for unusual noise or vibration that might indicate bearing wear or motor imbalance
- Verify thermostat response to temperature changes and emergency shutoff switches
You’ll receive a written service report, photo documentation, and a clear recommendation for your next maintenance visit. If the repair involved a major component, we’ll schedule a follow-up check 30 days out to confirm no recurrence.
- Provide a copy of parts warranty and labor warranty terms
- Recommend next inspection date based on unit age and repair history
- Suggest maintenance plan enrollment to catch problems earlier next time
- Leave our emergency contact for after-hours questions
Schedule Your RTU Service Visit
Our commercial HVAC team is standing by to assess your rooftop unit’s condition, whether it’s an emergency breakdown or a routine maintenance check. Fill out a service request below, and we’ll confirm your appointment details.
Financing Your Commercial HVAC Repair
Major rooftop unit repairs or replacements are significant business expenses — and they shouldn’t disrupt your cash flow. LMH Services partners with Wisetack for flexible commercial financing, so you can restore your building’s climate control and pay over time.
Financing Benefits
LMH Services has partnered with Wisetack to give you more ways to pay. Wisetack lets you check your options in seconds with no impact to your credit score, and offers simple monthly payment plans without the financial stress.
Keep Your System Running Strong with a Maintenance Plan
Protect your commercial HVAC investment. A maintenance plan from LMH Services keeps your rooftop units efficient, extends their operational life, and catches small issues before they become costly failures — for both Deer Park businesses and commercial properties across the greater Houston area.
Our Maintenance Plans Include
24 Hour Service Available
Plan members get priority access to our 24/7 emergency service line
Prompt, Local Service
We are locally operated in Deer Park and respond quickly
Expert Technicians & Installers
Thorough inspections that catch small issues before they become expensive repairs
Residential & Commercial
Plans tailored to homeowners and business owners alike
RTU Service Across the Houston Metro
LMH Services responds to commercial HVAC calls throughout southeast Texas from our home base in Deer Park, TX. We maintain fast response times by basing our team in Deer Park, with service centers and partnerships across the region. Whether your building is in a major metro zone or a smaller suburb, we’ve got it covered.
Serving Communities Around:
Not Sure If We Service Your Area?
Chances are we can help! We’ve served the southern Houston area for a while, so please call 832-800-4564 or contact us today to see if we come out to your area.
Frequently Asked Questions About Rooftop Unit Repair
A Rooftop Unit (RTU) is a self-contained HVAC system mounted on the roof. It includes the compressor, condenser, evaporator, and controls all in one unit, eliminating the need for a separate outdoor condenser and indoor air handler. Commercial buildings use RTUs because they’re reliable, space-efficient, and easy to maintain without taking up interior real estate. Most multi-tenant and retail buildings rely on them.
We recommend a full maintenance inspection at least twice per year: once in spring (before cooling season) and once in fall (before heating season if applicable). High-use buildings or units in harsh environments may benefit from quarterly checks. A preventive maintenance plan costs far less than an emergency repair or premature replacement.
Common RTU failures include refrigerant leaks (from age or UV exposure on the roof), compressor burnout (from low refrigerant or electrical stress), fan motor failure (from dust ingestion or bearing wear), and control board faults (from moisture or age). Most failures are preventable with regular inspections. We catch leaks and motor strain well before catastrophic failure.
For emergency calls, yes. If the failure is a simple capacitor, contactor, or fan motor replacement, we can often complete the work same-day. More complex repairs (compressor replacement, control board programming, refrigerant recovery and recharge) may take longer. We’ll give you a time estimate during the diagnostic call.
If a unit is 15+ years old, major component failure often signals end-of-life. Replacing an aging compressor on an old system rarely makes financial sense because other components will fail soon. We’ll walk you through the numbers: repair cost vs. replacement cost vs. expected lifespan. If replacement makes sense, we can discuss Armstrong and other efficient new systems, plus financing options.
Yes. Our technicians hold EPA 608 certification (required for any refrigerant handling in the US). We recover refrigerant safely, dispose of it properly, and recharge to exact system specifications. We’ll provide documentation of the recharge for your compliance records.
Yes. We offer customized maintenance plans that include spring and fall inspections, emergency priority dispatch, parts discounts, and labor savings. A maintenance plan pays for itself quickly by preventing emergency shutdowns and extending equipment life by years.
We service all major brands: Carrier, Trane, Lennox, York, Ruud, and others. Our technicians are trained on multiple platforms and carry reference materials onsite. If it’s an RTU made by a major manufacturer, we can diagnose and repair it.
That depends entirely on what’s failed. A capacitor replacement is a relatively low-cost fix, a fan motor costs more, and a compressor replacement is the most expensive of the three. We never quote over the phone—we diagnose first, show you the cost, and get your approval before we start work. Financing is available for major repairs and replacements.
Yes. We install new commercial HVAC systems, including rooftop units. We’ll help you choose a system that matches your building’s cooling load, recommend energy-efficient models, coordinate with your building management on installation timing, and handle all permits and testing.
Call LMH Services for Your Commercial Rooftop Unit Repair
Your building’s climate control is too important to leave to chance. When an RTU fails, every hour of downtime costs you tenants’ comfort, employee productivity, and potential revenue loss. We prioritize commercial calls and respond the same day for emergency repair requests across the Houston area.
Our technicians hold EPA 608 certification (required for any refrigerant handling in the US). We recover refrigerant safely, dispose of it properly, and recharge to exact system specifications. We’ll provide documentation of the recharge for your compliance records.
We service all major brands: Carrier, Trane, Lennox, York, Ruud, and others. Our technicians are trained on multiple platforms and carry reference materials onsite. If it’s an RTU made by a major manufacturer, we can diagnose and repair it.
Major equipment investments are easier to budget when you can spread payments over time. A new rooftop unit is a significant capital expense, and we work with financing partners including Wisetack to make system upgrades affordable.
Regular inspections prevent emergencies and extend your unit’s life by years. Members receive priority dispatch (you move to the top of the call list during emergencies), parts discounts, and priority scheduling for planned maintenance. A maintenance plan typically pays for itself within the first year.