Commercial Mechanical & HVAC Contractors in Wisconsin.

HVAC Installation & Replacement

We install and replace commercial HVAC equipment in new construction and existing buildings. That equipment includes rooftop units (RTUs), chillers, boilers, VRF systems, and ventilation. On new builds, that work is coordinated with our electrical scope from the start, so equipment and power are planned together instead of reconciled in the field.

When aging equipment needs to come out, our crews handle the replacement from removal of the old system through installation of the new one, and our EPA 608 certified technicians handle refrigerant safely and to code. See our commercial HVAC installation page.

Systems Integration

Mechanical systems only perform when they work with everything around them. We deliver HVAC coordination and mechanical-electrical integration for seamless performance, and our in-house BIM specialists model the electrical scope to catch clashes before they cost you change orders. The result is equipment, power, and controls designed to fit.

Building Automation Controls

Building automation ties your mechanical systems together. We install building automation controls that let facility teams monitor and manage their HVAC equipment. And because our low voltage crews also install security, fire alarm, and access control systems, your controls integrate with the rest of the building's technology from day one. See our low voltage systems.

Planned Maintenance Agreements

Our work doesn't end at closeout. Planned maintenance agreements put your HVAC equipment on a regular service schedule, helping it run efficiently, last longer, and show problems before they turn into failures. Agreements can cover the equipment we install, RTUs, chillers, boilers, VRF systems, and ventilation, with the same in-house crews and our own fleet behind them.

Service & Repair

When something stops working, facility owners and managers can call us for HVAC and mechanical service and repair. Our EPA 608 certified technicians diagnose the problem and get your system back in operation. Service requests are handled during office hours (Mon–Fri, 7am–4pm); call (262) 781-9210 to reach our team.

Planning a Commercial HVAC Replacement

Most commercial HVAC replacements start well before the old equipment comes out. Owners and facility teams should weigh the age and condition of the current system, how the space is used today compared with when the system was designed, and whether the existing electrical service, structure, and controls can support new equipment. A rooftop unit swap may change the roof curb; a boiler or chiller replacement can touch power, controls, and the layout of the mechanical room.

Timing matters too. Heating and cooling equipment is easiest to replace when the building can tolerate it being offline, and replacements in occupied buildings are sequenced around daily operations. Because we self-perform both the mechanical and electrical scopes, the power work a new unit needs is planned alongside the equipment itself, and the written inspection reports from a planned maintenance agreement help facility managers see a replacement coming before a failure forces the decision.

A replacement is also a chance to revisit the rest of the system. Ventilation and indoor air quality (IAQ) improvements, filtration upgrades, and building automation controls can often be handled in the same project, so facility teams end up with equipment that fits how the building runs today rather than a like-for-like swap of what was there before.

What to Have Ready for a Mechanical Bid

The more complete the information, the tighter the number. For new construction, send mechanical drawings and specifications, equipment schedules, and controls sequences, along with the project schedule and delivery method. For replacements in existing buildings, include the make, model, and age of the equipment coming out, photos of the equipment and the route to it, any roof or mechanical room constraints, and known problems with comfort, ventilation, or controls. Recent service or inspection reports on the existing equipment are worth including too, since they show its condition and history.

Also note whether the building will stay occupied during the work and whether electrical changes are part of the scope. Knowing both up front lets us price the mechanical and electrical work as one coordinated scope instead of two, with one schedule behind it.

Markets We Serve

We bring mechanical and HVAC work to the markets WIL-Surge Electric serves: commercial and retail buildings, healthcare facilities, schools and education campuses, manufacturing and industrial plants, and sports and public facilities. See the markets we serve or browse our projects. Working in the Milwaukee area? See our commercial HVAC contractors in Milwaukee, WI. Working in Dane County? See our commercial HVAC contractors in Madison, WI. Working in Brown County? See our commercial HVAC contractors in Green Bay, WI. Working in Kenosha County? See our commercial HVAC contractors in Kenosha, WI. Working in Racine County? See our commercial HVAC contractors in Racine, WI. Working in the Fox Cities? See our HVAC contractors in Appleton, WI. Working in Waukesha County? See our commercial HVAC contractors in Waukesha, WI. Working in western Wisconsin? See our commercial HVAC contractors in Eau Claire, WI.