Commercial Rooftop Units — Omaha Heating and Air Conditioning
Rooftop units (RTUs) are the dominant commercial HVAC configuration across light commercial and small-to-mid-sized commercial buildings in Omaha. The packaged equipment architecture — compressor, condenser fan, evaporator coil, supply blower, gas heat section or electric strip heat, controls, and economizer all integrated into a single cabinet mounted on the building roof — is well-suited to retail bays, restaurants, single-tenant offices, multi-tenant strip retail centers, light industrial buildings, and the building types that constitute most of our commercial customer base. Three manufacturers dominate the market with broadly equivalent equipment lines: Carrier (48HC/48LC series), Trane (Voyager series), and Lennox (Landmark series). Equipment selection between these manufacturers usually comes down to local availability, customer preference, existing equipment match, and specific feature requirements rather than fundamental capability differences. This page covers the RTU equipment we install and service, the maintenance and service work specific to rooftop-mounted equipment, the engineering constraints that drive successful installation, and pricing across typical commercial applications in Omaha.
Equipment We Install and Service
Carrier (48HC, 48LC, WeatherMaker, WeatherMaster Series)
- Carrier 48HC — 3-12.5 ton range, gas heat/electric cool packaged RTU. The dominant Carrier light commercial line for retail bay applications.
- Carrier 48LC — 3-12.5 ton range, electric heat/electric cool packaged RTU. Heat pump or strip heat configurations.
- Carrier WeatherMaster — 12.5-25 ton range, larger commercial configurations.
- Carrier 50TC/50LC — high-efficiency premium tier with variable-speed compressors.
- Bryant variants — Bryant-branded versions of Carrier equipment under separate dealer network; we service both.
Trane (Voyager Series, Precedent, Foundation)
- Trane Voyager 1 — 3-12.5 ton range, gas heat/electric cool, standard efficiency.
- Trane Voyager 2 — 12.5-25 ton range, mid-tier commercial.
- Trane Voyager 3 — 25-50 ton range, larger commercial applications.
- Trane Precedent — light commercial premium tier with eFlex variable-capacity compressor.
- Trane Foundation — budget-tier light commercial.
- American Standard variants — American Standard-branded Voyager equivalents through separate dealer network.
Lennox (Landmark Series, Energence)
- Lennox Landmark — 3-12.5 ton range, standard light commercial.
- Lennox L Series — 12.5-25 ton range, mid-tier commercial.
- Lennox Energence — premium tier with variable-capacity inverter compressors, ENERGY STAR certified.
- Lennox Strategos — larger commercial 25-50 ton range.
Daikin/Goodman, York, Trane Light Commercial
Other commercial RTU manufacturers we service: Daikin/Goodman Rebel commercial packaged units, York Predator/Sunline commercial RTUs, AAON light commercial (premium tier), Rheem/Ruud light commercial. Equipment availability and customer preference drive selection on specific projects.
RTU Configurations and Selection
Gas Heat / Electric Cool (Standard Light Commercial)
The most common configuration. Natural gas-fired heating section provides winter heat (typical capacities 80,000-260,000 Btu/hr input depending on RTU capacity), DX cooling section provides summer cooling. Used in retail bays, restaurants, single-tenant offices, and most light commercial applications. Advantages: lower operating cost on gas heat than electric strip, simpler equipment than heat pump RTUs, well-suited to Omaha’s climate with substantial heating load.
Electric Heat / Electric Cool (Heat Pump RTU)
Heat pump RTU with electric strip heat backup. Used when natural gas service isn’t available, in buildings transitioning to all-electric operation, or in applications where electric-only simplifies utility coordination. Cold-climate heat pump RTUs (Carrier 48LC with cold-climate technology, Daikin Rebel Heat Pump, Trane Voyager Air Cooled Heat Pump) maintain heating capacity at Omaha’s -4°F design temperature with appropriate strip heat backup.
Electric Heat Only (Strip Heat RTU)
Electric strip heat without heat pump. Less common in Omaha because of utility cost during sustained cold periods; used in applications with very limited heating load (warehouses with occasional spot heating needs, secondary spaces, etc.).
Premium Variable-Capacity (Inverter Compressor RTUs)
Premium-tier RTUs with variable-speed compressors and ECM blower motors deliver better part-load efficiency and tighter temperature control than single-stage equipment. Useful in applications with significant part-load operation: large retail spaces with variable occupancy, office buildings with varying tenant load, restaurants with peak-vs-off-peak service patterns. Carrier 50TC, Trane Precedent, Lennox Energence represent this tier.
Rooftop Curb — The Critical Installation Component
The rooftop curb is the structural mounting platform between the building roof and the RTU cabinet. Curb selection and installation quality determines:
- Weather sealing — the seal between RTU base and curb top, and between curb base and roof membrane, must be weather-tight to prevent water infiltration into the building.
- Vibration isolation — isolation curbs reduce structural vibration transmission from the RTU to the building below, important in occupied spaces.
- Structural support — the curb must support the RTU’s weight (typically 600-2,500+ lbs depending on capacity) plus snow and ice loads in winter.
- Roof penetration management — refrigerant lines, electrical conduit, gas piping, and condensate drain all penetrate the curb; proper seal at each penetration prevents water infiltration.
- Adaptation for equipment changes — replacement RTUs sometimes have different footprints than the original; adapter curbs or curb modifications address footprint mismatches.
Curb installation is typically done in coordination with the roofing contractor when the curb is being installed during new construction or substantial roofing work. For RTU replacements on existing curbs, we verify curb condition during the replacement project and address any issues before mounting the new equipment.
Specific RTU Service Work
Compressor Service
RTU compressors run substantially more hours than residential equivalents (often 4,500-8,760 hours per year vs. 1,800-3,500 residential). Common compressor service work:
- Capacitor replacement — single-phase RTU compressors use start and run capacitors that degrade over service life.
- Contactor replacement — compressor contactor points pit and burn from the high amperage cycling; periodic replacement maintains reliable starting.
- Compressor replacement — when major compressor failure occurs (typically 12-18 years into service life), replacement involves refrigerant recovery per EPA Section 608, removal of failed compressor, installation of replacement compressor (matched specifications), evacuation and refrigerant recharge, test run verification.
- Refrigerant management — charge verification, leak detection (commercial leak detection more rigorous than residential per EPA standards), reclamation when major work occurs.
Condenser Fan Service
- Fan motor replacement (typical 1/4 to 1/2 HP single-phase, larger on bigger RTUs)
- Fan blade replacement when damaged from debris impact (hail, wind-blown debris)
- Bearing service or motor replacement at end of service life (typical 10-15 years)
Gas Heat Section Service
- Burner cleaning and inspection
- Heat exchanger inspection (visual and borescope on accessible models)
- Ignition system service (hot surface igniter, flame sensor, intermittent pilot on older equipment)
- Gas valve replacement
- Combustion analysis with attention to specific RTU manufacturer recommendations
- Draft inducer motor replacement when failed
Blower Section Service
- Belt drive RTUs: belt replacement, sheave alignment, motor amperage check
- Direct drive RTUs: motor amperage verification, blower wheel cleaning
- Blower motor replacement at end of service life
- Sheave or pulley replacement when worn
Economizer Service
Economizers (the outdoor air dampers that bring in cool outdoor air for free cooling during appropriate weather conditions) are a code-required feature on most commercial RTUs in Omaha’s climate. Common service work:
- Damper actuator replacement (failure mode: actuator stuck in fixed position, eliminating free cooling capability)
- Outdoor air sensor calibration verification
- Economizer control logic verification
- Linkage and damper blade inspection
Economizer maintenance is sometimes neglected on RTUs because failed economizers don’t produce immediate symptom — the RTU still cools using mechanical cooling. But the energy cost of a failed economizer (mechanical cooling running during conditions when free cooling would have sufficed) accumulates substantially over time.
Roof-Top Specific Issues
- Hail damage — condenser coil fin damage from hail events (the May 2023 Sarpy County hailstorm produced substantial RTU coil damage across affected areas). Coil straightening or coil replacement depending on severity.
- Wind damage — debris-impact damage during severe wind events (the August 2020 derecho produced RTU damage across western Iowa commercial buildings).
- Snow accumulation — snow-blocked outdoor air intakes, snow accumulation on top of cabinets requiring removal during heavy snow events, snow drift around RTU disrupting condenser airflow.
- Roof leaks at curb — deterioration of curb-to-roof seal over years of thermal cycling; sometimes manifests as building leak rather than RTU symptom.
RTU Replacement Projects
RTU replacement is a substantial project requiring coordination across multiple work components:
- Initial assessment — existing RTU inventory (manufacturer, model, capacity, age, condition), curb dimensions and condition, building structural verification for replacement equipment weight.
- Equipment selection — matched capacity (Manual N commercial load calculation if substantial equipment scope change is contemplated), efficiency tier, configuration matched to building requirements.
- Permit pulling — mechanical permit through appropriate municipal authority (City of Omaha, suburban municipalities, or Iowa-side authorities). Larger projects sometimes require mechanical engineer review and stamped drawings.
- Crane scheduling — rooftop RTU replacement requires crane access. Coordination with crane service, traffic control if street access required, scheduling around building occupancy.
- Old equipment removal — refrigerant recovery, electrical disconnect, gas disconnect, removal from curb, crane removal from roof, transport to recycling facility.
- Curb verification or adaptation — existing curb checked for condition; adapter curb installed if footprint mismatch.
- New equipment installation — crane lift to roof, set on curb, weatherproofing verification, electrical reconnection, gas reconnection, refrigerant line connection (typically integrated in packaged equipment), condensate drain connection.
- Commissioning — refrigerant charge verification, combustion analysis on gas heat, electrical readings, economizer function verification, control sequence testing, customer demonstration.
- Permit closeout — inspection scheduled with municipal authority, signed permit closeout retained in customer file.
Typical replacement project duration: 1-2 days for single-RTU replacement on a working day with good crane access; multi-day for larger projects or buildings requiring after-hours work to maintain business operations.
Pricing
- RTU diagnostic visit: $285–$485 depending on equipment access and complexity.
- RTU service call (typical repair work): $385–$985 per visit including diagnostic.
- Compressor replacement (3-5 ton RTU): $2,485–$4,985 including parts, labor, refrigerant.
- Compressor replacement (5-10 ton RTU): $3,485–$7,485.
- Condenser fan motor replacement: $585–$1,485.
- Gas valve replacement: $585–$1,485.
- Heat exchanger replacement: often pencils toward RTU replacement rather than component repair on aging equipment.
- Economizer actuator replacement: $485–$985.
- RTU replacement (3-5 ton single-stage): $12,500–$22,500 installed including crane, permit, removal/disposal.
- RTU replacement (5-10 ton two-stage): $18,500–$38,500.
- RTU replacement (10-25 ton commercial): $35,000–$85,000+ depending on capacity, tier, and project complexity.
- Premium tier upcharge (variable-capacity vs single-stage): typically 15–30% above standard tier installed cost.
- Curb adapter installation: $1,485–$3,485 depending on adapter complexity.
Frequently Asked Questions
- How long do commercial rooftop units typically last?
- Typical service life 15–20 years for standard-tier commercial RTUs with appropriate maintenance, 18–25 years for premium-tier variable-capacity equipment. The wide range reflects how dramatically maintenance discipline affects RTU service life. Equipment receiving consistent quarterly or monthly maintenance often reaches the upper end of the range; equipment maintained reactively (service only when failure occurs) typically reaches end-of-useful-life at 12–15 years. Specific aging patterns: compressor failures cluster at 10–15 years on single-stage equipment, 15–20 years on variable-capacity equipment; condenser coil corrosion accelerates after 15+ years; cabinet deterioration becomes substantial after 18+ years. Commercial buildings often defer RTU replacement past the optimal economic point because the capital expenditure is substantial; the resulting compounding repair costs typically exceed the deferred replacement cost.
- What’s the difference between Carrier, Trane, and Lennox RTUs?
- Broadly equivalent capability with manufacturer-specific feature differences. Carrier and Trane have similar market positioning and feature sets; Lennox tends toward slightly more sophisticated controls integration in the premium tier (Energence line). Specific decision factors: existing equipment match (if you have all-Carrier in a multi-RTU building, staying with Carrier simplifies parts inventory and service familiarity), local dealer relationships (some areas have stronger Carrier vs Trane dealer networks affecting parts availability and service support), specific feature priorities (variable-capacity availability, controls platform compatibility), and customer preference based on prior experience. We service all three brands; equipment selection for new installation typically comes down to specific customer requirements rather than fundamental manufacturer superiority.
- Do I need a crane every time you service the rooftop unit?
- No, only for equipment replacement and certain major repair work (compressor replacement on some models, heat exchanger replacement on some models). Routine service work is performed on the roof with technicians accessing via roof hatch, ladder, or building stairs. Standard tune-ups, repair work, component replacement, and maintenance activities don’t require crane access. Crane scheduling is specifically for full RTU lifts off and onto the building roof during equipment replacement projects. Customers who hear “crane required” sometimes worry about disruption; in practice, the crane is on-site for a few hours during equipment replacement, not as a recurring operational concern.
- What does it cost to replace a rooftop unit?
- Wide range depending on capacity and complexity. Standard 3-5 ton single-stage replacement runs $12,500–$22,500 installed (includes equipment, crane, removal/disposal, permit). Mid-tier 5-10 ton two-stage replacement runs $18,500–$38,500. Larger commercial RTUs (10-25 ton): $35,000–$85,000+. Premium variable-capacity tier adds 15–30% above standard tier. Specific project factors that affect cost: curb adapter requirements (footprint mismatch between old and new), crane access complexity, after-hours work requirements, structural verification needs, building automation system integration. We provide detailed written estimates after initial assessment so customers know specific project cost rather than relying on broad range references.
- Should I repair or replace my aging rooftop unit?
- Decision factors similar to residential equipment but with commercial-specific considerations. Equipment age 15-20+ years with major component failure usually pencils toward replacement, especially when energy efficiency gap between old and new equipment is substantial. Single major component failure on otherwise-healthy equipment (12-15 years, no other developing issues) often justifies repair. The 40-50% rule applies: if a single major repair exceeds 40-50% of replacement cost, replacement usually pencils better. Commercial-specific factors: downtime tolerance during repair vs replacement projects, capital planning calendar (some businesses prefer batch replacement during planned capital cycles), tax treatment differences between repair and capital expenditure, building scope (single-RTU buildings have different decision dynamics than multi-RTU buildings where staged replacement is feasible).
Contact Omaha Heating and Air Conditioning
Our Regency Parkway office is in west Omaha at the I-680 and West Dodge Road interchange. For commercial rooftop unit service, replacement consultation, building assessment, or to discuss RTU configurations for new construction or tenant improvement projects, ask for Andre Patel during business hours.
- Emergency Line (24/7): (402) 258-6703
- Address: Lake Regency Building, 450 Regency Pkwy #370, Omaha, NE 68114
- Email: info@omahaheatingairconditioning.xyz
- City of Omaha Mechanical Contractor License: #MC-2014-08847
- Iowa Plumbing & Mechanical Systems Board License: #B-027841
- EPA Section 608 Universal: #608U-2014-227841
Office Hours
- Emergency Service: 24 hours a day, 7 days a week
- Office Staff: Monday – Saturday, 8:00 AM – 5:00 PM
- Closed: Sundays and State/Federal Holidays (emergency line always active)