Angela Pendergrass
Awesome service! Andrew is great, explained everything so well. They were at my home less than an hour after I called. Highly recommend!
Business ProfileHVAC Companies in Belleville, Illinois
All Seasons Heating & Cooling
All Seasons Heating & Cooling
All Seasons Heating & Cooling provides heating and air conditioning services in Belleville and nearby Illinois communities. Serving the area since 1999, it also offers indoor air quality, ventilation and specialty HVAC work.
Last Updated October 2, 2026.
Business Highlights
- The company is locally owned and family-operated.
- Its technicians are fully licensed and insured, and the company uses no subcontractors.
- It guarantees all work in writing.
- It has been an American Standard Comfort Specialist since 2009.
- An owner is present on every job site.
- The company offers a one-year installation labor warranty.
Service Area
Swansea, Belleville, Millstadt and O'Fallon, as well as surrounding areas in Illinois.
Active Business Listing
All Seasons Heating & Cooling is one of 7 HVAC companies ProsGrade lists in Belleville, Illinois.
Active
Public local listing
Listing details
8 services listed, including Air conditioning, Heating services and Boiler and radiator plumbing. Open weekdays, closed on weekends. Rated 5.0 from 11 reviews.
- Verified listing details
- Service information
- Customer review signals
- Photo gallery
- Public contact information
- Published local profile
How This Business Compares
How All Seasons Heating & Cooling compares with the other 6 HVAC companies on ProsGrade in Belleville, using public Google ratings and review counts.
- Rated 5.0 on Google, at or above the 4.9 average of other Belleville HVAC companies on ProsGrade.
- One of 6 Belleville HVAC companies on ProsGrade rated 4.7 or higher from at least 10 reviews.
Services Covered
8 services- Air conditioningInstallation, maintenance and repairs
- Heating servicesHeat pumps, furnace repairs and regular maintenance
- Boiler and radiator plumbingInstallation, maintenance and repairs
- Indoor air qualityAir filtration, purifiers, dehumidifiers and humidifiers
- Ventilation and ductworkAir duct installation and repair, custom ductwork and ventilation system installation
- Thermostat servicesSmart thermostat installation and repairs
- Specialty HVAC servicesMini-split installation; furnace and HVAC inspections
- Gas-line servicesInstallation and repair
Reviews
What customers say
Customers mention prompt service and technicians who explain the work clearly. One customer said the crew came out during a snowstorm and had the issue fixed by 9:30 a.m.; another praised efficient work, a clean work area and transparent pricing. A homeowner also said the team reinstalled equipment after an earlier installation was not working properly and built a box so the upstairs unit could drain.
Customer Reviews
DOCSHEETS
These guys are so amazing. I called at 8 am and they rushed out during the huge snowstorm and had it fixed by 930am , it was amazing service from the time they answered the phone til Andrew, the technician fixed it
Wally Kassebaum
We recently had work done by All Seasons Heating & Cooling, in Belleville, IL. and couldn't be more pleased with the entire experience. From the initial phone call to schedule service through the completion of the work, everything was handled with exceptional professionalism. The technician arrived promptly, took time to thoroughly explain what needed to be done, and completed the job efficiently while keeping the work area clean. The pricing was fair and transparent with no surprise charges, and the quality of workmanship was outstanding. It's refreshing to find a company that delivers excellent service at every touchpoint. We'll definitely be calling them for all our future HVAC needs and highly recommend them to anyone looking for reliable, quality service.
Dorothea Mueller
Excellent service from a company that truly cares about its customers. Everyone we interacted with was kind, patient, and attentive. They went above and beyond to ensure everything was working perfectly. Highly trustworthy and dependable!
Brian Kalish
I can’t say enough about All Season Heating And Cooling. Our home warranty company contracted a company to install a brand new HVAC and they did everything wrong. I don’t wanna go into too much detail, but let’s just say nothing ran properly or was installed properly. We had to find a company that could reinstall everything affordably and efficiently. After contacting All Season Heating And Cooling, they literally showed up the next morning at 7:30 as promised and reinstalled all the equipment properly and even had a metal works in one of their vehicles to build a box to put the HVAC upstairs on so it could drain properly. So now it is winter and the heat is working amazing upstairs and we can’t thank Jeff his son, his wife and their team for amazing work and customer service. I would call nobody else. There’s something to be said about a knowledgeable family run company that really knows what they’re doing. For what we paid, we still got a lot of value out of our new HVAC. It was money very well spent
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Frequently Asked Questions
Does All Seasons Heating & Cooling offer emergency or after-hours service?
Emergency services are available, and after-hours service is by appointment only.
What does All Seasons Heating & Cooling's seasonal maintenance club include?
It includes regular check-ups and tune-ups to prepare HVAC systems for changing weather. Members receive priority service.
Can All Seasons Heating & Cooling help with financing or efficiency rebates?
Financing options are available through Synchrony, and the company partners with Ameren Illinois on efficiency rebates.
What happens after an AC installation by All Seasons Heating & Cooling?
The team walks customers through operating the new system.