Commercial HVAC in Hermann, MO
Commercial HVAC in Hermann means keeping a business open while the equipment gets fixed. We repair, maintain and replace heating and cooling for offices, retail shops, tasting rooms and light commercial buildings, and every job gets priced before work begins.
- 4.7 on Google(15 reviews)
- Serving Hermann since 1998
- Office at 124 E 10th St
Commercial HVAC services
Commercial HVAC Repair
Fault found, options explained and work quoted before your business loses another day.
Rooftop Unit Service
Package units repaired, tuned or replaced, with curb, crane and access planned first.
Commercial HVAC Maintenance
Seasonal visits, filter changes and unit-by-unit records for property managers and owners.
Winery and Tasting Room HVAC
Crowded tasting rooms cooled, barrel rooms held steady, fermentation spaces ventilated.
What does a Hermann business need from commercial HVAC?
Start with the building, because that decides where the risk sits.
| Building | Usual pressure | Start here |
|---|---|---|
| Downtown brick storefront | Aging unit, awkward roof access | Rooftop unit service |
| Office or retail shop | Uneven zones, missed filters | Scheduled maintenance |
| Tasting room or event space | Full weekends outrun the system | Winery and tasting room HVAC |
| Any building, down today | Lost trade | Commercial AC and heating repair |
Tell us what your system is doing
Our office is open Monday to Friday, 8 AM to 4 PM. Call and we will sort out the next step.
Repair, maintain or replace?
Repair when one part failed on a unit with years left. Maintain on a schedule, so a spring visit finds what a hot Saturday would otherwise find for you. Price a replacement before you approve a large repair on an old unit, because the second quote often changes the decision.
A landlord or property manager usually wants the same three things in writing: what failed, what it costs and who signs off. Ask for them on any job.
Commercial heating and cooling we cover
We work on offices, retail, hospitality and light commercial buildings: rooftop units, split systems, furnaces, ductless zones and kitchen makeup air. Walk-in coolers are refrigeration, a separate trade, so ask first.
Bed and breakfasts need quiet equipment and room-by-room control. Tasting rooms need capacity for the crowd, not the empty room.
Inside Hermann's historic district, ask the city whether visible exterior equipment is reviewed before you pick a location for it.
Why hire a local commercial HVAC contractor?
- Our staffed Hermann office on E 10th St dates to 1998, so there is a front desk to reach.
- Electrical and plumbing are also on our trade list, which keeps a disconnect or drain problem under one roof.
- We quote the work before we start, which helps when an owner has to approve it.
Where our business HVAC service reaches
From Hermann we reach businesses in Berger, New Haven, Washington and Owensville. Have a photo of the unit's data plate ready and call (209) 563-1270.
Calling is fastest
Prefer to write it down?
Calling gets you an answer sooner, especially if the house is cold or hot right now. If it can wait, send the details and our office will get back to you during business hours.
Smell gas? Do not use this form. Leave the building and call from outside.
What customers say on Google
4.7 on Google(15 reviews)“Hot water heater went out and Brian worked with us to help us find the correct replacement parts, and the repair process. He is knowledgeable, reliable and very responsive. He came out saw that we needed one more possible part and said he wouldn’t charge us labor until the water heater was up and running. We got the right parts he came out to install and had us up and running! We will definitely rely on him again for any future issues with HVAC, water heater, and or plumbing issues! It’s so nice to have hot water again!”
“I can’t say enough good about Brian and his company. They are my go to guy’s. I’ve had them work for me about a half dozen times now. No need to look elsewhere. They are fair and responsive to your needs.”
“Brian consistently shows up when promised, completes the work correctly the first time, and provides quality products. I cannot recommend him more highly.”
Good to know
Common questions
Do you work on commercial buildings as well as homes?
Yes. We handle light commercial heating and cooling, including rooftop package units, split systems and furnaces in offices, shops and hospitality buildings. Say what the equipment is and when the building can safely lose heat or air, so the visit fits your trading hours.
Is restaurant refrigeration part of commercial HVAC?
No. Walk-in coolers and reach-in cases are refrigeration, not HVAC. In a restaurant, our HVAC work covers the dining room, the kitchen's comfort cooling and heating, and the makeup air that replaces what the hood exhausts. Ask the office about anything else before you book.
Who pulls the permit for commercial HVAC work in Hermann?
Ask before the work starts. As of late 2026 Missouri leaves HVAC contractor rules to local government. Check with city hall in Hermann or the county elsewhere, and get the name of whoever pulls the mechanical permit written into your quote.
Related services
Read next
Based at 124 E 10th St in Hermann, we work across Gasconade County and the towns around it, including Owensville, Morrison, Rhineland, Berger. See all the areas we serve.
Call Brian Grannemann Services
A Hermann company since 1998. Tell us what is going on and we will tell you what happens next.
- 4.7 on Google(15 reviews)
- Serving Hermann since 1998
- Office at 124 E 10th St