Heating and Cooling Service in Chicago, IL

SquareHVAC is based in Hillside, just west of Chicago. We repair, install and maintain heating and cooling systems for homes, apartment buildings and businesses in the city.

Which parts of Chicago we serve

We serve addresses across a large part of the city. Tell us your address when you call and we will confirm it. The communities we serve are listed on our service area page.

Emergency heating and cooling calls in Chicago

Emergency service is available 24/7, including Sundays. Tell us your Chicago address when you call so we can confirm coverage and current availability. Non-emergency visits outside routine service hours are scheduled for the next working period.

Repairs and new systems

We repair and install air conditioners, furnaces, heat pumps, ductless mini-splits and boilers. Many buildings in the city are heated with radiators or hot-water baseboards, and a boiler heats them; our guide to hydronic heating explains how that works. We also maintain heating and cooling systems, work on water heaters and ducts, and provide duct cleaning and indoor air quality products.

Apartment buildings and businesses

We work in offices, retail shops, restaurants and apartment buildings. We service rooftop units, split systems and boilers. Our commercial page explains how to request a visit and who approves the work. If you own or manage apartments, our guide to HVAC systems in apartments explains the common system types.

Prepare the right Chicago service request

A Chicago address alone does not tell us whether the equipment serves one room, one apartment or a whole building. A homeowner can describe the thermostat and the indoor and outdoor units. For a shared system, a manager should identify which spaces are affected, how the technician reaches the equipment and who can approve work. If an outage involves only one unit, that distinction matters before assuming a central boiler or rooftop system has failed.

The city says an in-kind furnace, boiler or air-conditioner replacement does not require a building permit. That is a specific category, not a blanket rule for every installation or alteration. Ask how the proposed scope is classified when reviewing the quote. Peoples Gas and ComEd serve different parts of the energy setup here, so it also helps to know whether the heating equipment uses gas or electricity when you call.