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Wiegmann & Associates Inc
650 FOUNTAIN LAKES BLVD, St Charles, MO 63301, USA
Verify this license yourself at the California Contractors State License Board (CSLB).
California's climate swings from coastal fog to inland heat waves, and that range puts real demands on heating and cooling equipment all year. Wiegmann & Associates Inc serves homeowners and property owners across the state with residential HVAC work. The company holds contractor license #731514 with the California state contractor registry and has been licensed since 1997, giving it more than 29 years in the trade.
Services Offered
Service Area
About Wiegmann & Associates Inc
The company's services cover the systems most households rely on. AC Services address cooling performance, from diagnosing refrigerant and airflow problems to repairs and replacement planning. Heating Services and Furnace Services keep winter comfort dependable through inspections, component repairs, and safety checks. Heat Pumps, which provide both heating and cooling, receive the same attention to controls and efficiency. Ductwork Services address leaks, poor airflow, and layout issues, while Thermostat Services cover calibration and control wiring. Maintenance and tune-up visits catch wear early, and Emergency HVAC calls respond to breakdowns that cannot wait.
Homes across California differ in age, layout, and climate zone, so the right repair or upgrade depends on the property. A system that performs well in one home may need different attention in another. Customers benefit from clear explanations of what is failing, what can wait, and what the options involve.
Comparing local HVAC pros is a sound step before booking service. Ask for written estimates, clear scope descriptions, and straightforward answers about warranties and timelines. For more contractor listings and guidance, visit HVAC Service Fast.
State license record
California license #731514
Active- Issued by
- Contractors State License Board (CSLB)
- Status
- Active as of Aug 4, 2026
- First issued
- Jan 1997 (29 years)
- Valid through
- Jan 31, 2027
- Business type
- Corporation
What the license covers
- C-20 Warm-Air Heating, Ventilating and Air-Conditioning
From CSLB public license data as of Aug 4, 2026. Licenses change — confirm the current status at the California Contractors State License Board (CSLB).
Frequently Asked Questions
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Local market — Saint Charles
HVAC pros here
14
Have a website
86%
Cooling demand
1,254
Heating demand
4,993
Cooling/heating demand = annual degree days (NOAA). Electricity = state residential average (EIA).
Local context for Saint Charles
- Wiegmann & Associates Inc is one of 12 businesses we list for ac services in Saint Charles (14 HVAC businesses in total).
Buying a new AC or heat pump in California
- California is in the DOE Southwest region: new central air conditioners installed since January 1, 2023 must meet at least 14.3 SEER2 and 11.7 EER2 (13.8 SEER2 and 11.2 EER2 for systems 45,000 BTU/h and larger). Heat pumps must meet 14.3 SEER2 and 7.5 HSPF2 nationwide.
- Since 2025, new systems are built for lower-impact refrigerants such as R-454B or R-32. Ask which refrigerant a quoted system uses and for its AHRI certificate number, which confirms the matched system’s rated efficiency.
Before you hire Wiegmann & Associates Inc
Based on the records we hold for this business.
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State license on record
CSLB lists #731514 as active (record dated Aug 4, 2026). Licensed since 1997. Re-check it yourself before work starts — it is free and takes a minute. Look it up: California Contractors State License Board (CSLB)
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Ask for proof of insurance
We have no insurance details on file. Ask for a certificate of general liability and workers' compensation coverage before anyone works in your home.
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Ask who pulls the permit
Replacing an AC, furnace, heat pump or water heater usually needs a local permit and inspection. A licensed contractor normally pulls it — ask that the permit is included in the written quote.
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Ask for local references
We do not have review data for this business yet. Ask for two or three recent customers near you.
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California homeowner protection
California law caps the down payment on a home improvement contract at 10% of the contract price or $1,000, whichever is less. Never pay more up front.
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Where this information comes from
- Name, address and phone
- State license records · added Aug 4, 2026
- California license
- CSLB public license data · record date Aug 4, 2026
- Profile summary
- Written automatically from the records above
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HVAC Service Fast is an independent HVAC directory and is not affiliated with this business. Listing details are compiled from publicly available information and may be incomplete or outdated. We do not endorse or guarantee any provider — please verify licensing and insurance directly. See our Disclaimer.