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Commercial HVAC
Repairs, maintenance, and equipment planning for buildings where downtime matters.
Learn more →Chicago area HVAC service
Comfort for your home. Continuity for your business.
A-3 Heating and Cooling brings 18 years of commercial, industrial, and residential HVAC experience to diagnostics, repairs, and planned maintenance. Available 24/7 for urgent service. Get a clear view of the problem and a sensible path forward.
18 yearsHVAC experience
Three service settingsCommercial, industrial, residential
One clear approachInspect, explain, prioritize
What we do
Service built around your system
A-3 helps customers make informed choices about comfort, reliability, and energy use.
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Commercial Refrigeration
Support for food service and cold storage equipment that businesses depend on.
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Home HVAC
Heating and cooling care with clear explanations and practical options.
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Preventive Maintenance
A repeatable approach to inspection, service, and system performance.
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Industrial HVAC
Support for larger, demanding environments and complex comfort needs.
Learn more →Why A-3
Experience that helps you decide.
A repair, a maintenance visit, and a replacement proposal each call for a different conversation. We explain the system condition so you can prioritize the work.
- Commercial and residential perspective
- Attention to energy waste and operating costs
- Practical recommendations for the equipment you have
- Clear next steps after diagnosis
How service works
From first call to next step
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Describe the problem
Tell us the location, equipment, symptoms, and how the issue affects your space
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Assess the system
We review operation and explain what the findings mean
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Choose the work
Discuss the repair or maintenance priorities before moving ahead
Need help with a heating or cooling system?
Contact A-3Common questions
Answers before you call
Do you service homes and commercial properties?
Yes. A-3 works across residential, commercial, and industrial HVAC settings, plus commercial refrigeration.
Can maintenance help lower energy use?
A system inspection can identify airflow, controls, and operating problems that waste energy. Specific savings depend on the equipment and site.
Do you provide 24/7 service?
Yes. A-3 is available around the clock. Call 773-552-0586 for urgent service.
How do I request service?
Call or text 773-552-0586 with your location, equipment type if known, and the issue you are seeing.