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WE’RE COMMITTED TO DOING HEATING & AIR BETTER THAN THE COMPETITION

BAU Mechanical is a customer-first commercial HVAC company built on one simple standard: do the job right, and stand behind it. We help building owners, facility managers, and business operators maintain reliable comfort year-round with dependable heating, cooling, and ventilation—delivered by technicians who take pride in clean workmanship, clear communication, and long-term system performance.

Built for Buildings. Driven by Craft.

Commercial HVAC isn’t just equipment—it’s uptime, operating cost, indoor comfort, and protecting the spaces where people work and customers visit. That’s why we approach every service call and installation with a detail-focused, performance-first mindset. Whether you need a fast repair, preventive maintenance, or a full system upgrade, our goal is to deliver solutions that run efficiently, operate safely, and fit your building’s demands and budget.

What We Do

We provide complete commercial HVAC support, including:

  • Rooftop unit (RTU) service, repair, replacement, and changeouts

  • Packaged and unitary system diagnostics and troubleshooting

  • Heating service (furnaces, make-up air, boilers where applicable)

  • Commercial air conditioning service and installation

  • Heat pumps and high-efficiency upgrades

  • Ventilation and indoor air quality solutions (filtration, HRV/ERV, controls support)

  • Preventative maintenance programs and seasonal tune-ups

  • Emergency repairs and fast-response service to minimize downtime

The BAU Mechanical Way

  • Straightforward recommendations. We explain what’s happening, what your options are, and what we’d do if it were our own facility.

  • Professional workmanship. Clean installs, clean work areas, and careful attention to details that impact performance and longevity.

  • Reliable service. We show up prepared, communicate clearly, and follow through—so you can plan and operate with confidence.

  • Efficiency-first approach. We help reduce energy waste, improve comfort consistency, and extend equipment life.

Why Customers Choose BAU Mechanical

  • Experienced commercial technicians and proven troubleshooting

  • Honest guidance without pressure

  • Quality parts and best-practice installations

  • Maintenance programs that reduce breakdowns and extend equipment life

  • A team that respects your property, your tenants, and your schedule

Our Mission

To deliver commercial HVAC service businesses can count on—reliable comfort, efficient operation, and a service experience that stays simple from the first call to the final walkthrough.

Testimonials

SEE WHAT YOUR NEIGHBORS ARE SAYING ABOUT BAU Mechanical Inc.

Lindsay B.
Lindsay B.
16:15 28 Jul 26
We had an amazing and speedy experience with BAU... Mechanical! From the moment we realized we had a problem with our AC Unit, we knew we needed to call in the pros.Tim was my first point of contact. He was friendly and professional from the beginning. He walked me through some troubleshooting over the phone and based on that, explained what was likely the problem and had a service call scheduled for early the next day. Adam was the tech who reached out to confirm his ETA. He was knowledgeable, friendly and prompt! I asked if I could watch what he was doing as he worked and explained, I would never try fixing this on my own, but I like to learn. He was great! He explained what he was doing along the way. Adam confirmed Tim’s suspicions that it was likely the capacitor. He showed me the part, and explained a bit about it. Adam quickly replaced it as he had the part on hand, tested it and, voila—Working AC! Adam also cleaned the filter, and waited a few minutes after I turned it back on to ensure that when I turned it back on, all was working as expected. It was truly great to have such a positive experience with friendly, knowledgeable professionals without feeling any pressure to unnecessarily jump to the conclusion of replace our unit (which was a big worry for us!). Thank you so much Tim and Adam!read more
Alicia W.
Alicia W.
19:20 20 Jul 26
Our pool heater stopped working showed error... code, we contacted Hayward manufacturer they provided HVAC contacts in our area. We chose Bau as they had reviews regarding pool heaters the others did not. Bau was great they were able to squeeze in service call same day and had parts on hand to repair. They had heater back up and running same day at a reasonable price as our heater no longer had warranty coverage. We highly recommended the company and service tech Ryan really knows his stuff when it comes to pool heaters. TYread more
Trevor S.
Trevor S.
01:29 05 Jun 26
Great experience with BAU installing our attic... heat pump. Everything went smoothly, very professional crew. Highly recommend.read more
Jeff V.
Jeff V.
21:46 04 Jun 26
BAU recently installed our first Air conditioning... unit. They were punctual, profession and respectful. Tim was very friendly and not pushy at all. Adam and Bill had the whole unit installed by the time I got home. They were friendly and respectful to my wife and kids and were even done ahead of schedule.read more
mary jane D.
mary jane D.
21:31 04 Mar 26
Great service! Our furnace was not working had... another company in and they could not determine issue said we need new Furnace. Decided to get 2nd opinion and BAU technician came and determined in 5 minutes our filter was clogged due to using humidifiers. Problem resolved. Highly recommend this company.read more
Ethan M.
Ethan M.
19:24 10 Oct 25
These guys are incredible!! Installed everything... for us very quickly and their pricing can't be beat. Highly recommend.read more
Brady P.
Brady P.
18:35 10 Oct 25
Very professional and knowledgeable company, have... used before and will use again on many projects.read more
Kal D.
Kal D.
18:21 10 Oct 25
Had our AC system repaired, the team was prompt... and professional. Would recommend!read more
Sonnarc Homes L.
Sonnarc Homes L.
16:41 07 Oct 25
We've had the pleasure of working with the team... at BAU Mechanical on many past projects, as well as personal home renovation/build projects. They're responsive, efficient, and always able to offer up a solution and stand by their work. We look forward to working with them for many years to come - highly recommend!read more
Chris H.
Chris H.
00:11 04 Oct 25
Would recommend these guys. They came pretty... quick, did a good job and gave me some maintenance tips. Super easy to deal with. Pricing was fair. No complaints at allread more
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Areas We Serve

PROVIDING SERVICE TO ALL of Kitchener-Waterloo-Cambridge and the surrounding areas

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Cambridge

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Guelph

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Kitchener

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Waterloo

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Ariss

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Ayr

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Blandford-Blenheim

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Brant

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Breslau

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Centre Wellington

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Conestogo

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East Zorra-Tavistock

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Elora

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Fergus

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Gads Hill

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Guelph/Eramosa

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Hamilton

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Mapleton

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New Dundee

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New Hamburg

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North Dumfries

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Perth East

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Puslinch

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Saint Agatha

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St. Jacobs

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Tavistock

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Wallenstein

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Wellesley

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West Montrose

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Wilmot

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Woolwich

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Proudly serving in Conestogo

Proudly serving in Waterloo

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