Rooftop units
Packaged RTU replacement with equipment identification, capacity review, curb and transition planning, accessories, economizers, controls interfaces and crane logistics.
RTU · Packaged gas/electric · Heat pumpNorthern Illinois Southern Wisconsin
U.S.-basedChicago headquarters
Supporting skilled union labor and qualified trade partners.
Commercial HVAC replacement
and service, measured correctly.
Guardian Facility Group coordinates commercial equipment replacement, diagnostics, repair and recurring service. From rooftop units and make-up air to refrigeration, controls, sheet metal and mechanical piping, each request begins with the building, operating requirement and verified field conditions.
Field capability plus project coordination
From first service call to operational handoff.
We begin with the equipment, building conditions, operating problem and schedule. Guardian then coordinates appropriate contractor, technician, supplier and controls resources. Availability, licensing, permits, insurance, site conditions and final scope are confirmed before an engagement is accepted.
Commercial equipment replacement
Replace the system.
Preserve the operation.
Replacement planning accounts for capacity, ventilation, electrical service, gas, curb or structural conditions, duct transitions, controls, lifting, access, permits, startup and commissioning. Guardian coordinates the full replacement path with qualified trade resources.
Make-up air units
MUA replacement and upgrade coordination for ventilation, pressurization and process-exhaust applications, including heating, airflow and control requirements.
MUA · Tempered air · VentilationDedicated outdoor air
DOAS replacement planning around outside-air volume, conditioning, humidity objectives, energy recovery, controls integration and distribution requirements.
DOAS · ERV · Outdoor-air treatmentDehumidification units
DHU replacement support for commercial spaces with defined temperature and moisture-control requirements, including condensate, controls and airflow coordination.
DHU · Humidity control · Specialty applicationsMini-splits and VRF
Ductless and multi-zone replacement for offices, equipment rooms and targeted conditioning applications, with line-set, condensate, electrical and control review.
Mini-split · Multi-zone · VRF/VRVExhaust and ventilation
Exhaust-fan, supply-fan and ventilation-equipment replacement coordinated with airflow, roof conditions, curbs, interlocks, make-up air and code requirements.
Roof exhaust · Inline fans · Supply airAir handlers and split systems
Commercial AHU, fan-coil and split-system replacement with coil, fan, refrigerant, piping, filtration, electrical, controls and access considerations.
AHU · Fan coil · Commercial splitUnit heaters and specialty equipment
Replacement coordination for unit heaters, infrared heat, cabinet heaters and other commercial mechanical equipment suited to the building and application.
Heating · Specialty equipment · Exact identificationCommercial service work
Respond. Diagnose. Restore.
Guardian coordinates qualified commercial service resources for operating problems, planned repairs and recurring facility needs. Emergency and after-hours response is evaluated case by case based on location, trade requirements and technician availability.
Start a service requestDiagnostics and repair
No-cooling, no-heating, airflow, electrical, refrigerant, combustion, sensor and control issues.
Planned corrective work
Quoted component replacement, deferred repairs, equipment restoration and facility punch-list work.
Commercial refrigeration
Walk-ins, reach-ins, condensing units, evaporators, defrost systems and temperature controls.
Controls and automation
Controllers, thermostats, sensors, actuators, sequences, scheduling and BAS coordination.
Airflow and ventilation
Fans, belts, dampers, duct systems, air balance concerns, exhaust and make-up air.
Mechanical support
Sheet-metal modifications, hydronic systems, pumps, valves, gas piping and equipment connections.
Replacement-project coordination
A single operating picture for the equipment, trades, suppliers and field conditions that shape a commercial replacement.
- Survey and equipment identification
- Exact-match and engineered replacement paths
- Accessories, interfaces and trade coordination
- Logistics, startup and closeout planning
Controls packages
Control replacement and upgrade packages developed around the building, equipment sequence and owner requirements.
- Unitary and zone-control packages
- Sensors, actuators and control panels
- Sequence review and field coordination
- Startup and owner-handoff planning
Building automation
Building-automation assessment and coordination for light-commercial and mid-sized facilities, including practical retrofit paths and integration planning.
- BAS and control-system modernization
- Remote visibility and scheduling objectives
- Multi-unit and zoning applications
- Qualified controls-partner coordination
Commercial refrigeration
Service coordination for commercial refrigeration equipment and supporting controls, from operating issues and component replacement to planned maintenance.
- Walk-in and reach-in systems
- Condensing units and evaporators
- Temperature, defrost and control issues
- Repair-versus-replace evaluation
Sheet-metal systems
Fabrication, supply, installation and field-service coordination for commercial air-distribution and equipment-transition requirements.
- Custom ductwork and fittings
- RTU curbs, adapters and transitions
- Exhaust, ventilation and make-up-air systems
- Field measurement, fabrication and installation
Gas and process piping
Qualified mechanical-piping resources for new work, equipment replacement and facility modifications, subject to site conditions, permits and applicable licensing.
- Natural-gas distribution and equipment connections
- Hydronic heating and chilled-water piping
- Commercial process-piping applications
- Pumps, valves, supports, insulation and testing
Recurring preventive maintenance
Protect uptime before peak season.
Planned maintenance creates predictable service intervals, cleaner equipment and fewer surprises. Guardian evaluates single-site and multi-site programs around operating schedules, equipment population and documented service needs.
Recurring filter changes scheduled around equipment, occupancy, operating conditions and access requirements.
Condenser and evaporator coil cleaning planned to support heat transfer, airflow and reliable operation.
Pre-cooling-season inspection, cleaning and operational checks before sustained warm-weather demand.
Pre-heating-season inspection and functional checks aligned to equipment type and site requirements.
Documented visits for commercial HVAC and refrigeration assets, with scope and frequency matched to the facility.
A consistent request and scheduling path for qualified multi-unit, multi-site and property-management needs.
Need a recurring filter or seasonal program? Include the site count, equipment count, filter sizes if known, preferred frequency and access window.
Build a service requestControls and automation
A practical path to better building control.
For appropriate light-commercial applications, Guardian can evaluate control packages using Prolon equipment alongside other compatible solutions. Prolon designs application-specific HVAC controllers for commercial buildings with a streamlined, non-proprietary architecture.
Explore Prolon Controls ↗Regional service territory
Northern Illinois.
Southern Wisconsin.
Guardian evaluates qualified commercial and industrial opportunities throughout the Chicago metropolitan area, Northern Illinois and Southern Wisconsin. Final coverage depends on trade requirements, technician availability, travel, permits and project scope.
Chicago metroNorth and northwest suburbsRockford corridorLake and McHenry countiesKenosha and Racine regionQualified regional projects
Request commercial service
Tell us what the building needs.
Complete the short outline. The button prepares a text message for Guardian. Review the message on your phone before sending. For direct assistance, call (773) 835-5323.
Do not include passwords, payment-card information, access codes, personal identifiers or regulated information. A request is not a confirmed appointment. Guardian will review fit, availability and required contractor qualifications. See our Service Availability Terms.
Multi-brand service and supply
The right equipment path starts with exact identification.
Guardian coordinates service, replacement planning and supply research across major commercial HVAC, refrigeration, controls and hydronic equipment families. Model, serial, capacity, voltage, refrigerant, controls and site conditions are reviewed before a replacement or component path is proposed.
Commercial HVAC equipment
Trane · Carrier · Daikin Applied · American Standard · YORK · Lennox · AAON · Rheem · Ruud · Goodman · Amana · Bosch · Mitsubishi Electric · Fujitsu · LG
Hydronics and pumps
Bell & Gossett · Grundfos · Taco Comfort Solutions · Armstrong Fluid Technology
Controls and field devices
Johnson Controls · Honeywell · Siemens · Schneider Electric · Belimo · Prolon Controls
Refrigeration and components
Copeland · Sporlan · Danfoss · Heatcraft · Hussmann · Russell · Trenton · KeepRite Refrigeration
Service and supply, scoped correctly.
Availability, warranty channel, contractor qualifications and manufacturer requirements are confirmed for each request. Brand names identify equipment and compatibility requirements; all trademarks belong to their respective owners.
Request equipment support