J.M. Brennan, Inc.

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About J.M. Brennan, Inc.
J.M. Brennan, Inc. has operated as a mechanical contractor serving the Milwaukee area for multiple decades, delivering heating, ventilation, and cooling solutions to commercial properties and residential communities. The company maintains a rating of 3.6 stars from 29 client reviews and can be reached directly at (414) 342-3829 during standard business hours Monday through Friday from 7:30 AM to 5:00 PM.
Client testimonials reveal particular expertise in serving senior living communities, with one property manager specifically noting the company's consistent professionalism across multiple months of ongoing work for senior living facilities. The team has demonstrated competence in maintaining climate systems for multi-unit residential properties throughout the Milwaukee metropolitan region.
Recent feedback highlights specific instances of technicians going beyond standard service expectations. One reviewer described how a J.M. Brennan driver voluntarily exited his vehicle to assist a customer in lifting a 100-pound package during subzero winter conditions, demonstrating the kind manner that multiple five-star reviewers have emphasized in their assessments of the company's service approach.
What Customers Say
Six detailed reviews show an even split, with three five-star ratings praising senior living community work and above-and-beyond customer assistance, while three one-star reviews cite concerns about company vehicle operation rather than HVAC service quality.
Working Hours
| SundayToday | Closed |
| Monday | 7:30 AM–5 PM |
| Tuesday | 7:30 AM–5 PM |
| Wednesday | 7:30 AM–5 PM |
| Thursday | 7:30 AM–5 PM |
| Friday | 7:30 AM–5 PM |
| Saturday | Closed |
Services
Commercial HVAC Maintenance
Ongoing preventive maintenance for heating and cooling systems in commercial properties and multi-unit facilities.
Senior Living Community HVAC Service
Specialized climate system care for assisted living facilities and senior residential communities.
Heating System Repair
Diagnostic and repair services for malfunctioning heating equipment in commercial buildings.
Cooling System Repair
Air conditioning repair and troubleshooting for commercial and residential HVAC systems.
HVAC Installation
New heating and cooling system installation for commercial properties throughout the Milwaukee area.
Preventive Maintenance Programs
Scheduled tune-ups and inspections designed to extend HVAC equipment lifespan and prevent breakdowns.
System Diagnostics
Comprehensive evaluations to identify efficiency issues and recommend appropriate repairs.