HVAC Company in Evanston, IL

Since 1890, our HVAC company in Evanston, IL, has been the trusted choice for homeowners and commercial property owners throughout Chicago’s North Shore area in need of complete HVAC services. Our commitment to providing superior workmanship at the most competitive prices imaginable has helped us maintain our loyal, growing customer base throughout the past century.

John J. Cahill, Inc. is so much more than just an HVAC contractor; our company is an institution that consistently proves why we are your go-to option for any heating, ventilation, or cooling service needs you require. From simple maintenance and repair to brand-new installations, we do it all so you and everyone else in your building can live comfortably.

Air-Conditioning and Home Cooling Services

  • Central Air-Conditioning Repair and Installation
  • Mini Ductless Split AC and Heating System Repair and Installation
  • SpacePack High-Velocity Heating and Cooling System Repair and Installation
  • Geothermal Heat Pump Repair and Installation
  • Poor AC Performance Consultation
  • Ductwork Remediation to Troubleshoot Heating and Cooling Problems

Heating Services

  • Furnace Repair and Installation
  • Forced Air Heating System Repair and Installation
  • Residential and Commercial Boiler Repair and Installation
  • Hydronic Heating Repair and Installation
  • In-Floor Radiant Heating System Repair and Installation
  • Geothermal Heat Pump Repair and Installation
  • Snow Melt System Repair and Installation
  • Electric Baseboard Heater Repair and Installation
  • Low-Profile Garage Heater Repair and Installation
  • Mini Ductless Split Heating and Cooling System Repair and Installation
  • Ductwork Remediation for Air Distribution Problems
  • Poor Heating Performance Consultation
  • Steam to Hot Water Conversion System Repair and Installation

NATE and EPA-Certified Technicians

Chicagoland is known for bringing some extreme weather from season to season. That means you are going to want to make sure you have an HVAC system in place that is optimized for performance. The team at our HVAC company is trained and certified to ensure the complete success of your heating, cooling, and ventilation systems.

Whether you are signing up for scheduled maintenance, receiving 24-hour emergency services, or just asking some related questions to our NATE and EPA-certified technicians, we are always there to assist you. No matter how big or small your space is, we know how to maximize your comfort while improving the reliability, economy, and performance of your HVAC system through proper sizing, installation, routine maintenance, and periodic checkups.

Did You Know?

  • The best time to have your boiler or furnace serviced is each year in the late summer.
  • Boilers require water to transfer heat from the main burner to the rest of the house. This means it is important that you have your water levels regularly checked.
  • A poorly performing furnace might have nothing to do with your equipment’s actual capacity or operation. Sometimes the issue might be with poor air flow.
  • Heating technology is advancing at such a rate that sometimes it is more cost-effective to consider a replacement than it is to repair a damaged or underperforming system.
  • Cottonwood trees are popular throughout the North Shore and Chicagoland area, but their white puffballs and silky seeds can clog your condensing unit. It is important to have your AC unit serviced every spring to ensure optimized efficiency.
  • Most second-floor cooling problems are actually not very difficult to fix when you work with a skilled professional like those at our HVAC company.
  • SpacePak provides a cooling solution for homes that aren’t built to handle central air-conditioning systems.

Contact us when you are in need of any type of HVAC services for your residential or commercial property. Our company is proud to provide free estimates to clients located throughout the Evanston, Illinois, area.