Commercial Rooftop AC Unit Services in Mukwonago, WI

When your business depends on comfortable, reliable indoor space, your rooftop AC unit can’t be an afterthought. It has to run quietly in the background, keep employees and customers comfortable, and do it all without driving up energy costs.

At Midwest Heating & Cooling, commercial rooftop units are what we work on every day. Our team designs, installs, maintains, and repairs rooftop air conditioning and heating systems for offices, retail spaces, restaurants, manufacturing facilities, and more throughout the Mukwonago area.

Whether you’re replacing an older unit, troubleshooting recurring issues, or planning a new building, we’ll help you choose and care for a rooftop system that fits your business, your budget, and your long-term energy goals.

What Is a Rooftop AC Unit?

A rooftop AC unit (often called a rooftop unit, RTU, or rooftop air conditioner) is a packaged HVAC system installed on the roof or a mechanical platform. Instead of having an indoor furnace and a separate outdoor condenser, all the major components sit in one cabinet outside the building and connect to your ductwork.

That single rooftop cabinet can provide:

• Cooling: like a traditional air conditioner, using a refrigeration cycle to remove heat from the air.
• Heating: with either gas heat, electric heat, or a heat pump.
• Ventilation and filtration: bringing in outside air and filtering it before it enters the occupied areas.
  

Because the equipment is outside, you gain valuable indoor space and keep most of the equipment noise out of your work areas. For many commercial buildings, rooftop systems are the most practical way to deliver consistent heating and cooling to multiple zones.

If you’re not sure what type of unit you have today (gas/electric, all-electric, or heat pump), our technicians can identify it on site and walk you through your options.

Why Businesses Choose Rooftop Air Conditioning Systems

A properly designed rooftop AC system does more than blow cold air. It becomes a key part of how your building runs day to day.

Here are some reasons commercial clients choose rooftop HVAC systems:

• Free up floor space: With the unit on the roof, you keep mechanical equipment out of showrooms, kitchens, warehouse aisles, and office ceilings. That space can be used for staff, inventory, or customers instead.
• Simplified service access: Your RTU is in a defined location on the roof, away from foot traffic. Technicians can work safely and efficiently without disrupting your operations.
• Scalable design: Multiple rooftop units can be installed to serve different parts of the building. That makes it easier to zone offices separately from production areas or kitchens.
  
• Energy-efficient options: Modern rooftop HVAC systems can include energy-saving features like variable-speed fans, advanced economizers (which use cool outside air when conditions allow), and high-efficiency compressors and heat pumps. These upgrades help reduce energy use while maintaining comfort.
  
• Better comfort control: When designed correctly, an RTU can handle temperature, humidity, and ventilation together, giving your staff and customers a more stable indoor environment year-round.
  

Our role is to match these advantages to your actual building conditions, budget, and plans for future growth, never a one-size-fits-all approach.

Commercial Rooftop AC Unit Installation & Replacement

Replacing or installing a rooftop AC unit is not just “swapping a box.” It’s a project that affects your comfort, energy bills, and even safety for the next 15–20 years.

When your business partners with Midwest Heating & Cooling, you get a team that:

• Evaluates your existing HVAC systems:  We look at your current equipment, ductwork, controls, and how your building is actually used during the day.
  
• Right-sizes the unit: We calculate the correct capacity so your rooftop air conditioner isn’t oversized (short cycling and wasting energy) or undersized (struggling to keep up on peak days).
• Reviews all fuel options:
  • Gas/electric rooftop units
    
  • All-electric units with heat pumps
    
  • Dual fuel rooftop AC units, which combine a gas furnace and a heat pump in one cabinet for flexible, efficient operation.
    
• Plans the crane and curb work: Proper rigging, curb height, and weather sealing are critical so the unit sits level, drains correctly, and stays watertight.
  
• Coordinates around your business hours: We aim to minimize downtime and keep your doors open whenever possible.
  

You’ll get a clear proposal, straightforward pricing, and an honest conversation about payback, maintenance costs, and realistic life expectancy.

Rooftop AC Unit Repairs and Emergency Service

Commercial rooftop air systems work hard in Wisconsin weather. Sun, snow, wind, ice, and debris all take a toll on components over time. When something goes wrong, you feel it quickly inside your building.

Common issues we see on rooftop AC and heating units include:

• Fan and motor failures
• Refrigerant leaks or low charge
• Frozen or dirty coils
• Faulty ignition or gas valves in heating sections
• Economizer and damper problems
• Thermostat or control failures
  

Our technicians are trained specifically on commercial rooftop units and packaged systems. We troubleshoot the entire system, not just the immediate symptom, so you’re less likely to face the same breakdown again next month.

If your unit is older, has repeated failures, or is no longer energy efficient, we’ll walk you through the repair-versus-replace decision with real numbers, not pressure. And when you have a critical failure after hours, our 24/7 emergency service means you’re not left without heating and cooling when you need it most.

Preventive Maintenance for Rooftop HVAC Systems

Routine maintenance is the difference between a rooftop unit that quietly serves you for years and one that fails when your building is full.

A typical maintenance visit on a rooftop AC unit includes:

• Replacing or cleaning air filters
• Cleaning condenser and evaporator coils
• Inspecting belts, bearings, and fan assemblies
• Checking electrical connections and safety controls
• Verifying refrigerant levels and temperatures
• Inspecting gas burners or heat pump operation
• Testing economizer function and outside air settings
  

Because rooftop units sit outdoors, components can crack, corrode, or dry out faster than equipment located indoors. Regular maintenance helps keep your system energy efficient, catches small problems before they become big bills, and supports better indoor air quality for your team and customers.

Midwest Heating & Cooling offers a customized Maintenance Care Plan for commercial clients. We’ll tailor visit frequency, scope of work, and scheduling to your building and your budget.

Energy Efficient and Dual Fuel Rooftop Options

If you’re planning a replacement, it’s a good time to look at efficiency and fuel choices, not just tonnage.

We can help you evaluate:

• High-efficiency rooftop air conditioners: Units with higher efficiency ratings that use advanced compressors and controls to reduce energy use.
• Heat pump rooftop units: These use refrigerant to move heat in both directions, providing heating and cooling from one system. In many situations, they can heat your building more efficiently than straight electric resistance heat.
• Dual fuel rooftop systems: These combine a gas furnace with a heat pump in the same cabinet. The heat pump handles milder weather very efficiently, and the gas furnace takes over when outdoor temperatures drop. This hybrid approach can balance comfort, energy costs, and fuel availability.
  

During a consultation, we’ll look at your utility rates, run hours, and building use so you can choose a system configuration that supports both comfort and the bottom line.

Why Businesses Trust Midwest Heating & Cooling

Your choice of contractor matters as much as the brand of rooftop AC unit you install.

Midwest Heating & Cooling is:

• Licensed, bonded, and insured
• Rated A+ with the Better Business Bureau (BBB)
• Experienced in commercial rooftop units, not just residential systems
• Focused on long-term relationships, not one-time sales
  

Our team understands the real-world pressures you face: managing budgets, minimizing downtime, keeping tenants happy, and staying code compliant. We’ll talk to you in clear terms, explain every recommendation, and treat your facility like our own.

Schedule Rooftop AC Unit Service in Mukwonago Today

Whether you need a new rooftop AC unit, a second opinion on a major repair, or a maintenance plan for your existing HVAC systems, we’re ready to help.

Call 414-842-4778 or request service online to schedule a commercial rooftop unit consultation with Midwest Heating & Cooling.

FAQs About Commercial Rooftop AC Units

How long does a commercial rooftop AC unit typically last?

Most commercial rooftop AC units last around 15–20 years with proper maintenance. Harsh weather, lack of filter changes, dirty coils, or poor installation can shorten that life. Investing in regular maintenance visits helps protect your equipment and delay full replacement.

Are rooftop AC units energy efficient?

Modern rooftop HVAC systems can be very energy efficient, especially when they include high-efficiency compressors, variable-speed fan motors, and well-tuned economizers. Choosing the right size unit, sealing ductwork, and setting up proper controls are just as important as the nameplate efficiency rating.

What is a dual-fuel rooftop AC unit?

A dual fuel rooftop unit combines a gas furnace and a heat pump inside the same cabinet. In milder weather, the heat pump provides efficient electric heating. When temperatures drop, the system automatically switches to the gas furnace for stronger heating performance. This hybrid approach can help control operating costs while maintaining comfort.

How often should a commercial rooftop unit be serviced?

Most businesses benefit from at least two maintenance visits per year, typically in spring before cooling season and in fall before heating season. Facilities with heavy usage, sensitive equipment, or stricter indoor air requirements may need more frequent visits.

Can one rooftop AC unit serve my entire building?

In smaller or single-zone buildings, one properly sized rooftop air unit may be enough. Larger or multi-use buildings often use several rooftop units to serve different areas or zones. We’ll review your layout, occupancy patterns, and comfort complaints to design a zoning approach that fits your space.