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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.

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
Kyle G.
Kyle G.
23:25 01 Oct 25
The BAU team is fantastic! Really came through... for my family. We opened our pool this year to find out our pump was done. Responsive, fair, reliable. Would use them again. Highly recommended.read more
Tommy Z.
Tommy Z.
13:59 07 Aug 25
Great service, very reasonable pricing. Fixed the... issue quickly and didn't try to oversell anything. Will be using them for all future needs. Definitely recommend them.read more
ray C.
ray C.
13:08 12 Jun 25
The entire BAU team is very professional and a... pleasure to deal with. The team diagnosed my pool heater; the heater was beyond repair and a replacement was installed and operational within 1 day. Communication skills and their personalities made the entire process comfortable. Will definitely use them again for any hvac needsread more
Shannon H.
Shannon H.
17:40 12 Aug 24
Brad's team was part of our bathroom fan install.... They did an awesome job! They were polite, efficient and clean. Bill did a great job. Highly recommend!read 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

Ayr
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Breslau
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Tavistock
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Perth East
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Hamilton
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Gads Hill
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Fergus
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Elora
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East Zorra-Tavistock
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Brant
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Puslinch
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North Dumfries
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New Hamburg
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Blandford-Blenheim
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Wilmot
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Cambridge
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Kitchener
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Mapleton
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Centre Wellington
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Wellesley
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Wallenstein
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New Dundee
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Guelph
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Guelph/Eramosa
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Ariss
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Woolwich
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West Montrose
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St. Jacobs
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Saint Agatha
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Conestogo
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Waterloo
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Proudly serving in Ayr

Proudly serving in Breslau

Proudly serving in Tavistock

Proudly serving in Perth East

Proudly serving in Hamilton

Proudly serving in Gads Hill

Proudly serving in Fergus

Proudly serving in Elora

Proudly serving in East Zorra-Tavistock

Proudly serving in Brant

Proudly serving in Puslinch

Proudly serving in North Dumfries

Proudly serving in New Hamburg

Proudly serving in Blandford-Blenheim

Proudly serving in Wilmot

Proudly serving in Cambridge

Proudly serving in Kitchener

Proudly serving in Mapleton

Proudly serving in Centre Wellington

Proudly serving in Wellesley

Proudly serving in Wallenstein

Proudly serving in New Dundee

Proudly serving in Guelph

Proudly serving in Guelph/Eramosa

Proudly serving in Ariss

Proudly serving in Woolwich

Proudly serving in West Montrose

Proudly serving in St. Jacobs

Proudly serving in Saint Agatha

Proudly serving in Conestogo

Proudly serving in Waterloo

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