Light Commercial HVAC Services in Kirkwood and West St. Louis County

Kirkwood’s commercial inventory — the storefront retail along Argonne and Manchester, the small professional offices in renovated buildings near the Amtrak station, the restaurants along the historic Kirkwood Road corridor, the medical and dental practices in the strip plazas near St. Anthony’s, the boutique service businesses serving the Webster Groves and Crestwood markets — runs on light commercial HVAC that’s distinct from residential equipment in capacity, configuration, and service requirements. Commercial HVAC typically uses larger-capacity equipment (3–25 ton range), rooftop-mounted package units (RTUs), three-phase 208V/230V/460V electrical service rather than residential single-phase 240V, and produces direct operating-cost impact on the business that residential equipment doesn’t. A small restaurant losing AC during a Friday lunch rush in July loses revenue every hour service is delayed; an office with no heat on a Monday morning in January sends employees home; a retail storefront with humidity problems risks merchandise damage. This page documents the four commercial service categories we operate.

The Four Commercial Service Categories

Light Commercial HVAC

Repair, service, and component-level work on existing commercial HVAC equipment. Includes diagnostic, refrigerant service, capacitor and contactor replacement, control board service, motor and compressor work, ductwork modifications, and emergency response for no-heat or no-cool situations. Light commercial HVAC details →

Commercial HVAC Maintenance

Scheduled maintenance for commercial equipment with quarterly or bi-annual service visits depending on equipment usage intensity. Commercial maintenance scope is broader than residential due to higher operating hours, more critical reliability requirements, and the regulatory and insurance documentation requirements many businesses face. Commercial maintenance details →

Rooftop Units (RTUs)

Service, repair, and replacement of rooftop-mounted package units that combine heating, cooling, and ventilation in a single cabinet. RTUs dominate commercial HVAC because they consolidate equipment into a single rooftop location, free up interior space, and simplify service access. Common configurations include gas/electric (gas heating + electric cooling), heat pump (electric heat + cool), and electric/electric (electric heat + cool). RTU service details →

Commercial Service Contracts

Annual service contract structure for commercial customers wanting predictable maintenance cost, priority emergency dispatch, and budgeted equipment replacement timing. Service contracts are common for restaurants, medical practices, retail stores, and offices where HVAC reliability directly impacts revenue or operations. Service contract details →

How Commercial HVAC Differs From Residential

Equipment Capacity and Configuration

Residential equipment typically ranges 1.5–5 tons (18,000–60,000 BTU/hr cooling); light commercial equipment ranges 3–25 tons (36,000–300,000 BTU/hr cooling) per unit, with multiple units serving larger spaces. Configuration differences:

• Package vs. split: residential is mostly split (outdoor condenser + indoor air handler/furnace); commercial is heavily packaged (single unit with everything) typically on rooftops
• Capacity scaling: residential equipment standardized in 0.5-ton increments; commercial equipment in 1-ton increments, with multiple units commonly serving zoned spaces
• Refrigerant volume: commercial systems use substantially more refrigerant per unit; EPA Section 608 leak rate tracking and refrigerant inventory documentation are commercial requirements
• Air distribution: commercial uses larger ductwork, often with VAV (variable air volume) boxes for zone control, and outside-air ventilation requirements meeting ASHRAE 62.1 occupancy ventilation rates

Electrical Service

Residential equipment runs on single-phase 240V; commercial equipment commonly runs on three-phase electrical service:

• 208V three-phase: common in commercial buildings with delta-wye transformer configuration
• 230V three-phase: typical in older commercial buildings or smaller commercial spaces
• 460V three-phase: typical for larger commercial equipment (above 10 tons)
• Single-phase 240V: for the smallest commercial equipment (under 5 tons) when three-phase isn’t available

Service Window Constraints

Residential HVAC service typically happens during business hours when the homeowner is available. Commercial HVAC service often must happen during non-business hours to avoid disrupting operations:

• Restaurants: service typically scheduled before opening (early morning) or after closing (late night); kitchen exhaust hood and makeup air systems often require coordinated shutdowns
• Retail stores: service typically scheduled before opening or after closing during peak retail seasons (November–December)
• Medical and dental practices: service typically scheduled before patient hours or on closed days (Friday afternoons, weekends)
• Office buildings: service typically scheduled outside of 9–5 work hours or on weekends

Purisync schedules commercial service to match each business’s operating constraints, with after-hours and weekend service available for commercial customers.

Documentation and Compliance

Commercial HVAC service produces documentation that residential service typically doesn’t require:

• Service records for insurance: many commercial property insurance policies require documented HVAC maintenance for full coverage
• Refrigerant compliance: EPA Section 608 leak rate tracking with annual refrigerant inventory; commercial systems with leaks exceeding 35% annual leak rate require remediation reporting
• Indoor air quality documentation: ASHRAE 62.1 ventilation rate verification for occupied spaces; CO2 monitoring for occupancy-sensing ventilation control
• Energy efficiency reporting: some commercial customers report HVAC energy consumption for sustainability certifications (LEED, ENERGY STAR Portfolio Manager)
• Health department compliance: restaurant kitchen ventilation systems require periodic inspection and documented service for health department compliance

Replacement Project Scope

Commercial equipment replacement typically involves:

• Crane service for rooftop equipment: removing old RTU and setting new RTU on rooftop curb requires crane coordination, traffic control, and rooftop access logistics
• Roof curb modifications: replacing equipment of different specifications may require curb adapter or roof curb modification
• Electrical service coordination: three-phase electrical work coordinated with licensed electrician; commercial electrical inspection requirements
• Refrigerant management: larger refrigerant volumes require dedicated recovery equipment and certified cylinder handling
• Permitting and inspection: commercial mechanical permits through municipal authority with commercial mechanical inspection (typically more stringent than residential)

Typical Commercial Customer Profiles in Our Service Area

• Argonne and Manchester corridor retail: storefront businesses with 3–7.5 ton RTU configurations, typically gas/electric package units with rooftop mounting
• Kirkwood Road restaurant corridor: restaurants with multiple zones (dining, kitchen, bar, prep areas) requiring 5–15 ton equipment combinations, plus kitchen exhaust hoods with makeup air systems
• St. Anthony’s medical campus surroundings: medical and dental practices with 3–7.5 ton RTUs plus zone control for treatment rooms; HVAC reliability is critical for procedure scheduling
• Webster Groves professional offices: office buildings with 5–15 ton equipment, often older split systems with packaged rooftop units serving common areas
• Crestwood Plaza redevelopment area: mixed retail and office with varying equipment configurations from 3-ton single-unit installations to 25-ton multi-unit installations
• Town and Country office parks: larger commercial spaces with 15–25 ton equipment combinations and BMS (building management system) integration requirements

Pricing Summary

• Commercial diagnostic visit: $189–$280 (vs. $129 residential, reflecting the larger equipment, three-phase electrical work, and longer typical diagnostic time)
• Light commercial repair: typically $340–$1,480 depending on scope
• RTU service and component repair: $480–$2,800 depending on component and equipment size
• Commercial maintenance per visit: $240–$540 per RTU per visit (typically quarterly for active operation)
• Annual service contract: $1,800–$8,400 depending on equipment count, visit frequency, and inclusion scope
• RTU replacement: $9,800–$28,000+ per unit depending on capacity (3-25 ton range)
• Crane service for rooftop replacement: typically included in replacement quotes; $2,400–$4,800 separate line item

Commercial pricing reflects the larger equipment, three-phase electrical work, after-hours service availability, documentation requirements, and crane logistics for rooftop equipment. All commercial work performed under Purisync 2-year labor warranty with manufacturer parts warranties per equipment.

Frequently Asked Questions

Does Purisync handle commercial HVAC in Kirkwood?

Yes, light commercial HVAC service is one of our four service categories alongside residential repair, residential installation, and indoor air quality. Light commercial scope covers single-tenant retail storefronts, small to medium offices, restaurants, medical and dental practices, and similar commercial buildings with equipment in the 3-25 ton capacity range — the equipment scope between residential (5 tons and under) and large commercial (above 25 tons). We don’t typically handle large commercial HVAC (large office buildings, hospitals, industrial facilities) where commercial-only contractors with specialized equipment and crews have stronger capability. Light commercial is the natural extension of our residential capabilities with appropriate equipment specifications, three-phase electrical service capability, after-hours service availability for commercial constraints, and the documentation requirements commercial customers need for insurance, refrigerant compliance, and IAQ verification.

How is commercial HVAC service different from residential?

Multiple differences. Equipment capacity (residential 1.5-5 tons, light commercial 3-25 tons per unit with multiple units common); configuration (residential mostly split systems with separate outdoor/indoor units, commercial heavily packaged units typically on rooftops); electrical service (residential single-phase 240V, commercial commonly three-phase 208V/230V/460V); refrigerant volume (commercial systems use substantially more refrigerant with EPA Section 608 leak rate tracking required); air distribution (commercial uses larger ductwork with VAV boxes for zone control and outside-air ventilation meeting ASHRAE 62.1); service scheduling (commercial service often must happen during non-business hours); documentation (commercial requires service records for insurance, refrigerant compliance reporting, IAQ documentation, health department compliance for restaurants); and replacement project scope (crane service for rooftop equipment, roof curb modifications, commercial electrical inspection). Commercial pricing reflects these differences.

What’s the difference between residential and commercial pricing?

Commercial diagnostic visit runs $189-$280 versus $129 residential — the difference reflects larger equipment requiring more diagnostic time, three-phase electrical work requiring specific tools and procedures, after-hours service availability for commercial constraints, and the more involved documentation typical of commercial service. Repair pricing scales with equipment size and complexity: light commercial repair typically $340-$1,480 depending on scope. RTU service and component repair runs $480-$2,800 depending on component and equipment size. Commercial maintenance per visit runs $240-$540 per RTU. Annual service contracts run $1,800-$8,400 depending on equipment count, visit frequency, and inclusion scope. RTU replacement runs $9,800-$28,000+ per unit depending on capacity (3-25 ton range). Commercial pricing reflects the larger equipment, three-phase electrical work, after-hours service availability, documentation requirements, and crane logistics for rooftop equipment.

Can you service my equipment during business hours?

Sometimes yes, often no — depends on the specific service and business operations. Routine maintenance on RTUs typically can happen during business hours since the work happens on the rooftop without affecting indoor operations. Diagnostic and repair work that requires turning off the equipment must happen when the business can tolerate the equipment being offline; restaurants typically schedule before opening or after closing, retail stores during off-peak hours or before opening, medical and dental practices outside of patient hours or on closed days, office buildings outside of 9-5 work hours or on weekends. We schedule commercial service to match each business’s operating constraints. After-hours and weekend service is available for commercial customers; commercial service contracts include after-hours dispatch as a standard benefit so emergency response doesn’t depend on business-hour availability.

How fast can you respond to a commercial HVAC emergency?

Standard commercial emergency response: 2-4 hour response during business hours, 3-5 hour response after-hours and weekends. Faster response possible during peak demand seasons depending on existing customer commitments. Commercial service contract customers receive priority dispatch ahead of non-contract commercial customers and ahead of residential service calls — this is one of the primary reasons businesses with revenue-critical HVAC operations enroll in service contracts. Specific scenarios: restaurant with no AC during summer lunch rush, medical practice with no heat during patient hours, retail store with humidity damaging merchandise — these get same-day response when feasible. We handle commercial emergencies through the same 24/7 line as residential ((314) 338-5111) with James personally handling after-hours dispatch coordination.

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Contact Purisync Heating and Air

For commercial HVAC service, RTU repair or replacement, commercial maintenance scheduling, or commercial service contract consultation, contact our 325 N Kirkwood Road office at (314) 338-5111. Commercial customers can request site walk-throughs for equipment assessment, service planning, and quote consultation outside of regular residential service scheduling.

• Emergency Line (24/7): (314) 338-5111
• Address: 325 N Kirkwood Rd #245, Kirkwood, MO 63122
• Email: info@purisyncheatingairconditioning.xyz
• St. Louis County Mechanical Contractor License: #MC-2014-08439-STL
• Kirkwood Business Registration: #BL-2014-1187
• EPA Section 608 Universal: #608U-2014-385721

Contact Us →

Office Hours

• Emergency Service: 24 hours a day, 7 days a week
• Office Staff: Monday – Saturday, 9:00 AM – 5:00 PM
• Closed: Sundays and State/Federal Holidays (emergency line always active)