Commercial HVAC Contractor for Southeastern Wisconsin
We service the chillers, boilers, rooftop units, cooling towers and building automation controls in commercial and industrial buildings across ten southeastern Wisconsin counties with one team, so a fault that runs from a control sequence into a compressor never turns into three contractors pointing at each other.
Commercial and industrial facilities only, from an office in Waukesha, since 2008. Call (414) 899-4641
and you reach a technician.
The go-to team for complex repairs, rapid response, and hands-on support.
Why Facility Managers Call Us First
When a chiller quits the night before a school day or a rooftop unit drops offline over a leased floor, the next phone call decides how long the building stays down. Four things shape how that call goes.
- One vendor for the mechanical equipment and the building automation that operates it, so a fault traced from a sequence into a compressor stays with us from the first call through the repair.
- Chiller work is the core competence rather than a sideline, including high-tonnage centrifugal and screw machines, compressor overhauls, and condenser tube cleaning and replacement.
- Emergency calls reach a technician rather than an answering service, so diagnosis starts on the phone from the make, model and alarm code while the truck is being loaded.
- Scope, timing and cost are stated before a truck rolls, including what a part or a piece of specialty equipment adds to either one.
Founder Jim Jensen spent more than twenty years in Carrier and York factory service before starting the company in 2008. More than fifteen years on, we are still family owned and based in Waukesha, insured and bonded, with technicians holding master certifications and factory training from major equipment manufacturers.
Five Equipment Lines, One Service Company
Most contractors who answer the phone for commercial work cover part of a plant room. We cover the whole thing, from the machine making chilled water to the controller telling it what to do.
Chillers, Water-Cooled and Air-Cooled
Commercial chiller repair, scheduled service and replacement for high-tonnage centrifugal and screw machines through to scroll and reciprocating units. A visit measures refrigerant and oil pressures, approach temperatures, compressor amp draw and starter or VFD condition, and compressor overhauls and condenser tube cleaning and replacement are handled by our own technicians.
Rooftop Units and Packaged Systems
Commercial rooftop unit repair and replacement across single-tenant buildings, retail centers and multi-tenant offices. We verify charge against superheat and subcool, check economizer operation and outside-air position, measure airflow and static pressure, and test the gas heat section before the fall rather than after the first no-heat complaint.
Steam and Hot Water Boilers, Furnaces and Make-Up Air Units
Low-pressure steam in older school and municipal buildings, hot water and condensing systems in newer construction, plus unit heaters, radiant heaters and make-up air units. Combustion analysis with recorded readings, low-water cutoff testing, relief valve replacement, and feedwater and condensate return work.
Cooling Towers, Condenser Water and Pumps
Basin and fill cleaning, drift eliminators, gearbox oil, float and make-up, water treatment coordination, and freeze protection before winter. Tower and condenser water problems show up as chiller problems, which is why the same technician looks at both.
Installation, programming, integration and troubleshooting on BACnet, Modbus and LonWorks networks and on Johnson Controls, Honeywell, Carrier i-Vu, Trane Tracer and Siemens platforms. We pull trend logs, calibrate sensors against actual conditions, and find the point somebody left in hand two years ago.
Facility Types We Support
The buildings we service have one thing in common: when the equipment stops, somebody notices within the hour.
A chiller down before a school day puts classrooms, a gym and a server room in play at once, so we schedule the heavy work into summer break and school-year off-hours and keep the call answered when it cannot wait.
A rooftop unit offline over a leased floor becomes a tenant conversation before it becomes a repair order, so we diagnose the unit that is actually the problem instead of narrowing it across three trips to the roof.
Process cooling tied to a production line and process heat sharing a plant room with comfort heat are both jobs where downtime is measured in output, and we work on the chillers, towers and controls that carry them.
The Buildings That Call Us
Our work sits in school districts, hospitals, universities, manufacturing plants, office buildings and multi-facility commercial portfolios. Mechanical contractors also subcontract chiller work to our technicians, which is the plainest measure of the equipment depth on this team.
Facility managers and building engineers call us when the systems are complex, when downtime is not an option, and when they would rather hold one company accountable for the mechanical equipment and the controls than coordinate two.
Ten Counties Covered from One Waukesha Office
Trucks run from our office on Highview Road in Waukesha to commercial and industrial facilities in Waukesha, Milwaukee, Racine, Ozaukee, Walworth, Jefferson, Dane, Dodge, Columbia and Rock counties. Waukesha, Brookfield, Pewaukee, New Berlin, Menomonee Falls, Muskego, Milwaukee and Madison are all inside a normal service day, and portfolios spread across several counties are handled on one agreement with one number to call.
If your buildings sit in more than one of those counties, our
commercial HVAC service areas across Wisconsin show what we cover and who to ask for.
Questions Facility Managers Ask Before They Call
Do you work on commercial buildings only, or houses too?
Commercial and industrial facilities only. Advanced Chiller Services works on chillers, cooling towers, rooftop and packaged units, steam and hot water boilers, make-up air units, pumps and building automation controls in schools, offices, retail centers, hospitals and manufacturing plants. We do not take residential work.
Can one contractor handle both the HVAC equipment and the building automation system?
Yes, and that is how we are set up. The same technicians service the chiller and program the DDC controls that operate it, so when a zone is in alarm and the equipment appears to be running, one team traces the fault from the sensor to the compressor instead of handing it between a mechanical contractor and an integrator.
Which commercial HVAC contractors in southeastern Wisconsin work on large chillers?
High-tonnage centrifugal and screw chillers are our core work rather than an exception, including compressor overhauls and rebuilds and condenser tube cleaning and replacement. Our founder came out of more than twenty years in Carrier and York factory service, and our technicians hold master certifications and factory training from major equipment manufacturers.
How do I reach someone if equipment goes down after hours?
Call (414) 899-4641. Emergency calls reach a technician rather than an answering service, so the diagnosis can start from the make, model and alarm code while the truck is being loaded. Our office is open Monday through Friday, 8am to 5pm, for quotes, site visits and scheduled work.
What is your process for evaluating and upgrading older HVAC systems in existing facilities?
Upgrading an existing HVAC system starts with a detailed site assessment and a collaborative conversation with the facility manager or building owner. We analyze the performance, age, and service history of all major equipment—chillers, boilers, air handlers, controls, and distribution networks. Our diagnostics cover everything from airflow mapping and thermal imaging to energy use benchmarking, so we can pinpoint inefficiencies, recurring issues, and potential risks of future failure.
Our upgrade recommendations are always tailored to your business goals—whether that’s reducing energy costs, improving comfort, increasing reliability, or meeting new code requirements. We propose solutions that fit your budget and operational schedule, from phased component replacements to full system retrofits or controls integration. We’ll also assist with rebate or grant paperwork (such as Focus on Energy in Wisconsin) and guide you through every step of the upgrade process, minimizing disruption and maximizing long-term value for your facility.
Call and Reach a Technician, Not a Queue
Call (414) 899-4641 to talk through the equipment you are dealing with and get a site visit on the calendar. Text the same number if you are standing next to running equipment. Our office is open Monday through Friday, 8am to 5pm, and emergency calls are answered outside those hours.
