WHERE A-1 STARTED: HEATING AND AIR
Commercial HVAC Services
A-1 Services Group began as a heating and air conditioning company more than 20 years ago, and commercial HVAC is still the core of what we do. From our Oak Creek office we service rooftop units, furnaces and unit heaters, make up air and kitchen exhaust across southeastern Wisconsin, and because we also repair commercial kitchen equipment and electrical systems, one team covers the building and the kitchen inside it.
24/7 Emergency Service
200+ Manufacturers Serviced
90-Day Parts & Labor Guarantee
SIMPLE, FAST, RELIABLE
How Commercial HVAC Repair Works
Here’s how A-1 handles an HVAC call, from the first phone call to heat or cooling coming back on.
Call or Request Online
Call 414-404-9739 or use the online request form. Let us know if you’ve lost heat, cooling or ventilation, what the thermostat shows and whether people are in the building. No heat during a subzero cold snap goes to the top of the list.
Rapid Dispatch
A technician based in the Milwaukee area is assigned to your call. In winter, rooftop work means snow and ice, so tell us how the roof is reached and whether the hatch and path to the unit are clear; it gets the repair started faster and safer.
Diagnose & Repair
The technician checks the whole system, not just the part that stopped: ignition and flame sensing, heat exchanger condition, refrigerant, belts and motors, and the electrical supply feeding the unit. Any refrigerant handling meets federal EPA 608 requirements, and parts come off the truck when stocked.
Test, Document, & Follow Up
Before leaving, the technician confirms heat or cooling is reaching the space, checks safety controls and documents the visit. A-1 guarantees the parts and labor for 90 days, so a repeat of the same failure in that window brings us back at no charge.
THE A-1 DIFFERENCE
Why Choose A-1 Services Group For Commercial HVAC?
HVAC isn’t a side service at A-1; it’s where the company started. Here’s why Milwaukee area businesses trust us with their heat, cooling and kitchen ventilation.
Highly Skilled Technicians
A-1’s HVAC technicians have more than 20 years of company experience behind them and train through Tech24 University, so they understand rooftop units and the commercial kitchens underneath them.
We Stock the Most Commonly Used Parts
Trucks are stocked for Wisconsin weather: igniters, flame sensors, inducer motors, pressure switches, capacitors, contactors, belts and filters, so more no heat and no cooling calls are fixed in a single trip.
90-Day Guarantee
A-1 guarantees parts and labor on every A-1 HVAC repair for 90 days. If the same failure returns in that time, the return visit costs you nothing.
Planned Maintenance Programs
A fall visit checks burners, heat exchangers, ignition and make up air heat before the first cold snap; a spring visit cleans coils, checks refrigerant and tests cooling before summer. Filters, belts and safety controls are covered on both.
All Fuel Types & Configurations
Natural gas, propane, electric and heat pump equipment, including rooftop package units, unit heaters, split systems and direct fired make up air, in restaurants, stores, schools, offices and warehouses.
EMERGENCY: SHUT OFF THE UNIT
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FREQUENTLY ASKED QUESTIONS
HVAC Repair FAQ
Answers to the questions we hear most about commercial HVAC and exhaust system repair. Don’t see yours? Give us a call.
Yes. A-1 services all major commercial HVAC brands, including rooftop package units, split systems, furnaces, unit heaters and make up air units, and it works on older and legacy equipment that other contractors may pass on.
Share the make, model and age of your equipment when you call. For older units, the technician will tell you honestly whether a repair still makes sense.
Fix it when the unit is in good shape and the failure is a motor, capacitor, igniter or control. Replace it when an older unit loses its compressor or heat exchanger, breakdowns keep repeating, or it still uses R-22, a refrigerant US manufacturers stopped producing in 2020.
Replacement is a chance to cut energy use. Wisconsin businesses may qualify for Focus on Energy incentives on qualifying high efficiency HVAC, and an A-1 technician can quote both options on the same visit.
A-1 Services Group, based in Oak Creek, has provided commercial HVAC services and repair for more than 20 years across southeastern Wisconsin, including Milwaukee, Racine, Kenosha, Waukesha and Mequon.
A-1 services rooftop units, furnaces, unit heaters, split systems, make up air and kitchen exhaust for restaurants, stores, schools, offices and facilities, with 24/7 service for emergencies.
Yes. A-1 started in heating and air conditioning and now also repairs commercial cooking equipment, refrigeration and electrical systems, so one company and one number can cover the rooftop, the kitchen and the power between them.
That helps most when problems overlap: pilots that blow out because make up air heat failed, a walk in struggling because the kitchen runs hot, or a unit tripping because of a circuit issue.
Schedule a heating check in September or October. A technician should inspect burners and heat exchangers, test ignition and flame safety controls, check make up air heat, replace filters and belts, and confirm flues and intakes are clear.
A cracked heat exchanger or failed make up air heater found in October is a planned repair. Found in a January cold snap, it can mean a closed business, frozen pipes or a carbon monoxide risk.
HVAC REPAIR
No Heat Or No Cooling In Milwaukee? Call A-1
Whether it’s a rooftop unit blowing cold air on a January morning in Waukesha, a make up air unit freezing a Milwaukee kitchen or an AC unit icing up during a July heat wave in Racine, A-1 Services Group’s heating and cooling team is nearby. We cover southeastern Wisconsin from Oak Creek, 24/7.
