Commercial HVAC

Bay City, MI Commercial HVAC

Trusted HVAC Solutions for Businesses Across the Great Lakes Bay Region

At Custom Engineering, we’ve been helping businesses across the Great Lakes Bay Region stay comfortable since 1984. Whether you manage a small storefront in downtown Bay City, a busy office near Saginaw Township, or a large warehouse in Midland, your heating and cooling systems are essential to keeping operations running smoothly.

We offer tailored commercial HVAC services for businesses of all sizes, from system installations and replacements to troubleshooting and maintenance. Our team works closely with local businesses to deliver practical solutions that keep employees, customers, and equipment comfortable throughout Michigan’s changing seasons. 

If you’re planning to upgrade an outdated system or need HVAC support for a renovation or expansion, we’re here to walk you through your options.

Contact us today at (989) 474-2870 for a free estimate on your commercial HVAC installation or replacement!

Our Commercial Heating & Cooling Services

As a local company, we know how much our community relies on heating and cooling systems to keep things running smoothly through Michigan’s long winters and hot summers. We work with reliable brands like Trane and Mitsubishi Electric and back every installation with a 5-year labor warranty. Financing is available through Wells Fargo, including 0% options for those who qualify. 

Our services include:

  • Same-day or emergency HVAC repairs. Our team is available 24/7 when you call us for a quick response and assessment when your system isn't working or keeping up with demand. Emergency repairs are offered when needed and available.
  • Air quality solutions. From ventilation upgrades to adding humidifiers, we help improve the overall air quality in your building, which can make a big difference for comfort and productivity.
  • Thermostat services. Whether you're upgrading to a smart thermostat or fixing an older one, we handle installations, replacements, and adjustments to help you stay in control.
  • Ductless mini-split systems. Ideal for offices, server rooms, or hard-to-reach zones, we install and maintain ductless systems that give you more flexibility over temperature control.

If you’re dealing with uneven temperatures, rising energy costs, or just need dependable HVAC support, we’re here to help you find the right solutions for your space and budget.

Custom Comfort, Professional Care

What Makes Us Different?

At Custom Engineering, we will always put you first. That's why so many people in Linwood trust us time and again.

  • Affordable Financing Options
    We make HVAC services affordable with financing options offering 0% interest for 72 months.
  • Available Nights & Weekends
    No matter when you need us, we're ready to help. Someone is always available to answer your call.
  • Preventative Maintenance Plans
    Keep your system in perfect shape all year round with our programs.
  • Locally Owned & Operated
    As a proud Michigan company, we deliver honest, dependable HVAC services backed by local expertise and care.

Commercial HVAC Installation & Replacement

When it’s time for a new system, whether you’re expanding into a new space or replacing an aging setup, we walk you through the options and help you choose equipment that works well for your layout and daily needs. A well-matched system can lead to more consistent temperatures, better indoor air, and lower energy use over time.

We’ve handled installations across all kinds of commercial spaces, from small shops to large multi-unit buildings. Give us a call today at (989) 474-2870 or contact us online to find out more.

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Trusted by homeowners and Businesses Since 1984

At Custom Engineering, your satisfaction is our priority! See for yourself what our customers have to say about working with us.

    "They really came through!"
    Quick, efficient, and friendly service from both office staff and techs. Fair pricing. Grateful for their help on a freezing day when our furnace failed. Feared the worst. Highly recommend this company!
    - Tammie S.
    "They have been an excellent company to work with."
    Always courteous & competent. They installed a new furnace, AC, garage gas heater, and ran a gas line into our laundry room. They stayed on the job until all was completed and we were extremely satisfied.
    - Terrance V.
    "They did a great job!"
    We went through custom engineering for replacing our furnace and air conditioner. They went above and beyond to do what is best for our home. The whole team was respectful and informative. They answered any questions we had!
    - Allison E.
    "Nick was fantastic!"
    He got our furnace up and running again very quickly (on a Saturday!). Very personable and professional! We will definitely be using Custom Engineering Heating & Cooling again - thank you!
    - Krista W.
    "Custom Engineering took care of us right away!"
    Our initial call was after hours and not an emergency. We received a call first thing the next morning, and they came out within a few hours. Both gentlemen were very professional and knowledgeable, and were able to repair our furnace right then and there.
    - Reid K.
    "10/10 Service!"
    Had Customer Engineering come out to my restaurant to diagnose my furnace and walk-in freezer. Brandon and Skylar, the techs, were amazing. Extremely friendly and knowledgeable. I will be using them for all my HVAC needs moving forward.
    - Taylor A.
    "So grateful to them!"
    I needed help, and Custom Engineering got to me fast and saved the day. Nick, the technician, was great. He was personable and intelligent and he got my repair done super fast. Thanks, Custom Engineering!
    - James T.
    "By far the most professional and reliable company."
    Every employee I have had the pleasure of dealing with has been top-notch. Today's visit by Tyler for annual maintenance was great. He was punctual, friendly, and professional.
    - Michelle G.
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Commercial HVAC Maintenance

Staying on top of maintenance can make a big difference in how your system performs and how long it lasts. Our commercial HVAC service plans are designed to help you avoid downtime and keep everything running the way it should throughout the year.

Our commercial tune-ups typically include:

  • Full system inspections
  • Replacing or cleaning filters
  • Thermostat testing and calibration
  • Cleaning coils and ductwork
  • Addressing small concerns before they lead to bigger repairs

We’ll work with your schedule and building layout to create a maintenance plan that fits your business without disrupting daily operations. Whether you need seasonal tune-ups or a more frequent schedule, we’re here to help your system run the way it should.

Contact us today at (989) 474-2870 or online to schedule a service and discover how we can keep your business comfortable year-round.

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