Call for Service

(636) 757-2000

Available 24-hours a day for service emergencies.

Call to schedule preventative maintenance, new service and repairs.

Our COVID-19 Operations Guidelines

As COVID-19 continues to impact our communities, Wiegmann Associates’ goal is to keep our employees, clients and partners safe; ensure business continuity for our customers, and do our part to slow the spread of the virus.

HVAC Service for the St. Louis Region

Your building’s HVAC system is the lifeblood of your facility and likely its largest energy expense. HVAC service and preventative maintenance programs by Wiegmann Associates ensure consistent and reliable temperature control, comfort and air quality, with a focus on energy conservation.

As your facility systems advocate, we look beyond the immediate service or repair to find real solutions for the life of your building–long-term savings, energy efficiency and optimal comfort.

Our highly skilled professional technicians stay up-to-date on equipment and technology innovations. They also have access to the deep expertise of more than a dozen professional engineers at our headquarters, where we design/build some of the most complex HVAC installations across the country.

“We gave them more business the past few years based on customer service, their attention to getting the job right, and their preventative maintenance, keeping everything working.”
Sheryl Sinclair, Vice President of Facilities – Pulaski Bank

Wiegmann Doubles Service Team with Acquisition of SystemAire

We doubled the size of our HVAC service team in 2018 with the acquisition of SystemAire. This makes Wiegmann Associates one of the largest commercial heating and cooling service providers in the St. Louis region.

Join the hundreds of schools, healthcare facilities, financial institutions, corporations and government agencies that put their trust in Wiegmann Associates’ HVAC service.

Wiegmann Facility Service Solutions


Wiegmann Associates has the expertise to quickly and effectively maintain, service and repair your mechanical equipment. We tailor our service contract to your needs, taking the time to address your facility’s specific requirements.


A Wiegmann preventative maintenance contract ensures peak performance of your HVAC equipment while maximizing its useful life and minimizing energy costs.

We’ll tailor a preventative maintenance program to your unique needs, taking time to address your specific equipment and facility.

Wiegmann Associates preventative maintenance program benefits:

Enhanced reliability and comfort
Regular, scheduled maintenance and inspections
Priority 24/7 emergency service
Discounts on labor


Our repair technicians and schedulers use state-of-the-art, real-time fleet tracking software to ensure efficient and responsive service. This technology helps us to predict accurate arrival times through dispatch and ensure accurate billing.


Wiegmann Associates Engineers, Installers and Service Technicians are experts in Building Automation Systems (BAS) across a spectrum of industries and facility types

To maximize the energy efficiency of your HVAC system, we provide real-time insight into how your building really operates. Armed with the powerful data that Building Automation Systems provide, we can:

Improve occupant comfort with consistent temperature and humidity control
Reduce energy consumption
Reduce operating and maintenance costs
Enhance the efficiency of your HVAC, lighting, and other building systems
Provide an energy dashboard showing key energy performance indicators


Our responsive, skilled service technicians are available 24/7 in the St. Louis-region, to help you avoid business disruption in an emergency. Our technicians are always professional in your work environment. Schools, healthcare facilities, financial institutions, corporations and government agencies put their trust in Wiegmann service.