J M Brennan: Certified HVAC Repair Serving Milwaukee, WI 53201.0
2101 W Saint Paul Ave, Milwaukee, WI 53201.0
Provided Services
- Plumbing inspection
- HVAC installation or replacement
Q&A
What does a plumbing inspection from J M Brennan involve for a Milwaukee home?
Our thorough plumbing inspection is designed to give Milwaukee homeowners peace of mind. Our licensed professionals will check for leaks, assess water pressure, inspect fixtures and drains, and evaluate the condition of pipes, including those susceptible to our local freeze-thaw cycles. We look for signs of corrosion or blockage in your main sewer line, a common concern in older Milwaukee neighborhoods, and provide a clear, prioritized report on any issues found, along with repair options.
When should I consider a full HVAC system replacement versus a repair?
This is a common question, especially with Milwaukee's varying seasons. We generally recommend considering replacement if your system is over 15 years old, requires frequent and costly repairs, or struggles to maintain consistent comfort, leading to high energy bills. For older furnaces or AC units, a modern, efficient replacement can offer significant savings and improved reliability. During a consultation, our engineers will assess your system's age, efficiency, and your home's specific needs to provide an honest recommendation on the most cost-effective path forward.
My AC isn't cooling properly. Could it be a refrigerant leak or thermostat issue?
Yes, both refrigerant leaks and thermostat malfunctions are frequent causes of AC problems in our Milwaukee climate. A refrigerant leak will reduce cooling capacity and strain the compressor. Our technicians use specialized tools to locate and repair leaks, then properly recharge the system. A faulty thermostat might cause short-cycling or failure to turn on. We'll diagnose the issue—whether it's incorrect calibration, wiring problems, or simply a need for a newer, programmable model—and fix it to restore efficient cooling to your home.
Our Story
For over 90 years, J M Brennan has been a trusted, family-owned mechanical contracting firm serving Milwaukee and southeastern Wisconsin. Since our founding in 1932, we have built a reputation on expert design and installation for a wide range of systems, from complex industrial HVAC, boilers, and chillers to essential plumbing, sanitary sewers, and water treatment. Our skilled team of in-house designers, engineers, and fitters handles everything from food-grade and industrial piping to heat recovery and 24/7 emergency repair. Centrally located near downtown Milwaukee and equipped for any job, we are committed to providing reliable, long-term solutions for both residential and commercial clients across our community.
Business Location & Hours
| Mon: | 8:00 AM - 5:00 PM |
| Tue: | 8:00 AM - 5:00 PM |
| Wed: | 8:00 AM - 5:00 PM |
| Thu: | 8:00 AM - 5:00 PM |
| Fri: | 8:00 AM - 5:00 PM |
| Sat: | Closed |
| Sun: | Closed |

