We can install and service all makes, models and brands of heating systems, but we are proud to feature American Standard Heating systems. Based on American Standard's tradition of reliability, Cal-Sag is happy to offer the highest efficiency gas furnaces and heat pumps available in the Chicago market today.

Due to their space savings design, ease of installation, and astonishing efficiency, Mini-Split heating systems are used globally. We carry the Fujitsu brand Mini-Split Heat Pumps Systems. With innovations like variable speed compressors, inverter driven motors, and precise computer controls, Mini-splits are a smart selection for many Illinois home owners.

Proper heating units come with controls and systems that improve temperature regulation and indoor air quality. At Cal-Sag we supply control and indoor air quality systems from Honeywell and Aprilaire. With programmable electronic thermostats, air filters, UV lights, humidifiers and dehumidifiers, Honeywell and Aprilaire provide our customers the quality features their homes or businesses demand to offer outstanding comfort.

Other Repair and Maintenance Services:

• Emergency repairs on all makes and models
• New heater / furnace installations
• Vent repair and airflow improvement
• Freeze up repair
• Circulators and controls
• Boiler services
• Gas piping