Providing Comfort to Homes & Businesses

Person setting the temperature on a thermostat | Heating & Cooling in Cahokia, IL by Weir Heating & Cooling

Superior Heating & Cooling Services

Since 1983, Weir Heating & Cooling has provided quality heating & cooling services to communities in and around Cahokia, IL, and the entire Missouri and Illinois Bi-State area. Our team of experienced technicians cares for all of your heating, cooling, and ventilation repair and installation needs. We pride ourselves on the excellent service residential and commercial customers have come to expect.

We provide all of our services at competitive prices with financing options available. Our goal is to provide state-of-the-art results that completely satisfied our customers’ needs and budgets. You will find that your experience with our team is both efficient and informative.

It’s time to schedule your appointment!

Weir Heating & Cooling maintenance worker repairing and outdoor air conditioning unit in Cahokia, IL

What We Do


Our experienced HVAC professionals will help you select the heating and air conditioning system that will fit your specific lifestyle and your budget. We’ll work with you to determine the best size and features for your home or business.


Whether it’s a quick fix or a complicated job, we can help you! With nearly 40 years of experience, you can bet that we’ve seen it all over the years, and we know the best way to repair your heating & cooling system.


Weir Heating & Cooling offers furnace installation, repairs, and maintenance to keep you warm during the cold winter months.

Heat Pumps

For some homes and businesses, a heat pump is a great solution. We install, repair, and maintain heat pumps. If you’re not sure if you should have a furnace or heat pump, our team can help you determine the best option for your situation.

Ductless Mini-Split Systems

Ductless Mini-Split Systems can be an excellent investment and end up saving you money down the road. They are also more energy-efficient. We can install, repair, and maintain this cutting-edge product to ensure your comfort year-round.

Geothermal Systems

Geothermal systems are a simple, straightforward, and energy-efficient way to heat your home or business. Our skilled technicians can help you determine if these systems are the right solution for you.

Custom Sheet Metal Work

If your ductwork is not installed correctly, it can cause serious problems down the road. That’s why we offer custom sheet metal work to ensure the sizing of your system is correct so that your warm or cold air goes where you want it to go.


From ductwork repairs to tear-out replacements and new construction, our ductwork services are performed with strong attention to detail so that you will have strong results that will last for years to come.

Our team is ready to get to work for you!



Monday-Friday: 8:00 AM-4:00 PM