AC Installation & Replacement

AC Installation & Replacement in Bay City, MI

Trusted AC Installs from Custom Engineering That’s Been Around Since 1984

Thinking about replacing or adding AC to your property? We’ve been helping folks in Bay City, Saginaw, and Midland stay cool through Michigan’s sticky summers since the mid-80s. We've worked with all kinds of setups and layouts, from historic homes near downtown Bay City to commercial spaces and newer properties in Saginaw Township.

At Custom Engineering, we install reliable central air systems and ductless Mitsubishi Electric mini-splits, depending on what best suits your property and budget. If you're unsure where to start, no worries—we’ll walk you through your options and help you choose what works best for your space.

Contact us today at (989) 474-2870 or online and get a free AC installation or replacement estimate.

What to Expect with an AC Installation or Replacement

Getting a new air conditioning system isn’t just about replacing old equipment; it’s about creating a cooler, more comfortable home or property that fits your needs.

Whether you’re installing a new system or replacing an outdated one, here's how we handle the process:

In-home evaluation. We always begin by visiting your property to get a real sense of your space. Whether you have an older system or you’re starting fresh, we’ll inspect your current setup, including your ductwork. We'll discuss what’s been working, what hasn’t, and what you’d like to improve.
Personalized recommendations. Once we understand your space, cooling needs, and budget, we’ll present a few solid options. We typically install high-efficiency units from trusted brands like Trane and Mitsubishi Electric, which are ideal for Michigan homes and businesses that deal with humidity and temperature fluctuations.
Smooth, professional installation or replacement. If you're replacing an old system, we’ll remove the outdated unit and replace it with a high-performing model. Our team handles the full installation and tests everything before we leave and always take the time to answer any questions.

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Custom Comfort, Professional Care

What Makes Us Different?

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

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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.

Choosing the Right System for Your Property

Having the right AC system for your space depends on a few key things.

We’ll help you compare models based on:

Size and cooling capacity for your square footage
Noise levels that are important for bedrooms or living spaces
SEER ratings, which tell you how efficient the system is
Optional features like zoning or Wi-Fi thermostats

Whether you're looking at a ductless setup in a bungalow or a full central system for a larger property, we’ll guide you toward something that fits your space and your budget.

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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.

"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.
"My experience with the company was great!"
Chaz went above and beyond! He fixed my main house furnace and also advised me on my ceiling-mounted furnace in my back building. Thank you for your quick response. I will use you again!

- Ann K.
"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.
"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.
"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.
"They did an excellent job - all in one day!"
I always try to keep my business local, so I called Custom Engineering. They always answered my calls promptly, and the service was friendly with experienced technicians. They were prompt, courteous, and really put my fears to rest. Great job!

- Debbie M.
"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.
"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.

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Save Energy, Save on Cooling

Newer AC units are built to be more energy-efficient than older models, which means they can help lower your cooling bills over time, especially during those hot and humid Michigan summers. Many of the systems we install are ENERGY STAR® rated. And if you're looking for a more flexible way to pay, we offer 0% financing through Wells Fargo for qualified homeowners.

Should You Repair or Replace Your AC?

Sometimes a system can be fixed, but sometimes replacing it just makes more sense. If your AC has been acting up, here are a few signs that it might be time to consider an upgrade:

Repairs are becoming more frequent or costly
Cooling is uneven or unreliable from room to room
Your energy bills keep climbing
The system is over 10–15 years old

We’ll evaluate your current unit and help you weigh the options, without pushing you one way or the other.

Warranty & Support You Can Count On

We take pride in our work and are always here to assist you. All installations come with a 5-year labor warranty for peace of mind. If something doesn’t seem right after installation, you’ll talk to a real person when you call us at any time of day. We’re available 24/7 to help troubleshoot and walk you through the next steps if needed.

Call (989) 474-2870 today or contact us online to schedule your free estimate for AC installation or replacement in Bay City or nearby areas.

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