HVAC Repair in Bay City
Heating & Cooling Repairs for Bay City Homes & Businesses Since 1984
When your heating or air conditioning stops working, your whole routine comes to a halt. Mid-Michigan weather doesn't give you much wiggle room when temperatures drop off Saginaw Bay or climb during humid summer afternoons. Are you dealing with strange furnace clanking, uneven airflow, or an AC unit blowing lukewarm air? You don't have to guess what's going wrong or wait around for answers. At Custom Engineering, we get your system back on track quickly so you can get back to normal life.
We've been fixing heating and cooling systems across Bay City and the Tri-Cities region since 1984. Our licensed technicians handle everything from gas and fuel oil furnaces to central air units and Mitsubishi mini-splits. We show up on time, run precise diagnostics, and give you clear, upfront pricing before any repair work starts. You'll always know exactly what your system needs, backed by four decades of honest local service.
If your system isn’t working right, call us at (989) 474-2870 to schedule a repair visit.
Signs Your System Needs Attention
Some problems are hard to miss. An air conditioner blowing warm air, a system that runs constantly without reaching the set temperature, or strange banging and rattling sounds are all signs something isn’t right. Uneven temperatures from room to room are worth a service call too.
On the heating side, a furnace that won’t run, cycles on and off repeatedly, or leaves part of your home cold deserves a closer look. The sooner a problem gets diagnosed, the less chance it has to grow into a larger repair.
Why Michigan Weather Is Hard on HVAC Equipment
Michigan’s climate puts real strain on heating and cooling systems. Winters here are cold enough to push furnace ignition systems and heat exchangers hard through months of near-continuous use. Bay County’s proximity to Saginaw Bay also creates a humid microclimate that adds extra load on cooling equipment during July and August.
That seasonal stress is one reason Michigan requires HVAC contractors to hold a Mechanical Contractor license through LARA’s Bureau of Construction Codes before they can legally install, alter, or service HVAC equipment. Hiring a licensed contractor helps protect you and keeps any work done on your system code-compliant.
Custom Comfort, Professional Care
What Makes Us Different?
What Backs Our Repair Work
Custom Engineering has served the Bay City area since 1984. Our HVAC professionals are licensed and insured, and we hold dual manufacturer authorization: we’re an authorized Trane dealer and a Mitsubishi Electric Ductless Pro Elite Contractor, trained directly by the manufacturer to service Mitsubishi Electric systems. A technician who knows the equipment at the manufacturer level can diagnose problems accurately and source the right parts without guesswork.
Reducing Repeat Repairs
We listen to what you’re experiencing before recommending a course of action. There’s no pressure to replace equipment that can be repaired, and no incentive for us to recommend work you don’t need.
For customers who want to protect their investment going forward, we offer preventative maintenance programs that can reduce unexpected breakdowns and can extend equipment life. Extended warranty options are also available for added equipment and labor protection beyond standard coverage.
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Convenient Financing Options
We make HVAC services manageable with convenient financing options. Subject to credit approval.
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Preventative Maintenance PlansKeep your system in perfect shape all year round with our programs.
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Locally Owned & OperatedAs a proud Michigan company, we deliver honest, dependable HVAC services backed by local expertise and care.
HVAC Systems We Repair in Bay City
We work on the full range of heating and cooling equipment found in Mid-Michigan homes and businesses: central ducted air conditioners, ductless mini-split systems, heat pumps, furnaces, and boilers. We service equipment from Trane and Mitsubishi Electric along with other brands commonly installed throughout the region.
Our team handles both residential and commercial properties. Whether it’s a home that needs a furnace repair before the first hard freeze or a commercial building with a failing cooling system in the middle of summer, we handle both.
What to Expect During a Repair Visit
Every repair call starts with an honest assessment of what’s wrong and why. We provide upfront pricing before any work begins so there are no surprises. Same-day repair service is available when our schedule allows, so you’re not waiting longer than necessary to get your system running again.
Call (989) 474-2870 to schedule your HVAC repair in Bay City.
Early Warning Signs & Basic Upkeep
Short cycling, where a unit turns on and off frequently rather than completing a full run, can point to low refrigerant or an airflow restriction. Neither problem resolves on its own.
One of the simplest things any property owner can do is change air filters regularly. A clogged filter restricts airflow and forces the system to work harder than it should. Technicians who handle refrigerant are also required to hold EPA Section 608 certification, a federal requirement that governs how refrigerant is recovered and managed during service.
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.
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"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.
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"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.
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"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.
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"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.
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"I don't know what I do without this company!"Chaz did an amazing job - straightforward and very helpful. Jason and Trey set up the furnace a week ago, and it runs amazingly! It's nice to stay warm again. They just repaired and replaced my bathroom exhaust fan, too. Thank you again!- Cesily W.
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"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.
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"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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"This business is the best!"We bought our kitchen hood system from them, which they also installed (no small task). They are dependable, efficient, and do great work. Prices are what I would expect for the job. Don't hesitate to hire them.- Marinell S.
Serving Bay City & Mid-Michigan
Custom Engineering serves homes and businesses across Bay, Saginaw, and Midland Counties. Our customers include residents and businesses in Kawkawlin, Essexville, Freeland, Linwood, Midland, and Saginaw, and the same team that handles residential calls also covers commercial properties throughout the area.
Get Your System Diagnosed
If your heating or cooling system isn’t performing the way it should, don’t wait for a small problem to become a bigger one. We can assess your system honestly and tell you what it needs. If a new installation makes more sense than a repair, we provide free, no-obligation estimates so you can make an informed decision.
Ductwork, Air Filters, & Indoor Air Quality
Leaky or poorly sealed ductwork can force a heating or cooling system to work harder and lose conditioned air before it ever reaches the room. The result is higher energy use and uneven comfort, often without any obvious sign that the ducts are the problem.
Keeping ductwork clean and changing filters regularly supports both system efficiency and indoor air quality. Neglected filters allow dust and allergens to circulate through the home or building, which affects the air everyone inside is breathing. Both are worth including in any routine maintenance plan.