Carbon Monoxide Detector Installation in Chicago, IL
Chicago's bungalows and two-flats almost all have gas boilers or furnaces and gas water heaters in the basement, and the city requires carbon monoxide detectors within 15 feet of every sleeping room in homes with fuel-burning appliances or attached garages. In multi-unit buildings, landlords must provide them in each unit.
Older two-flats commonly have two small services in the basement, sometimes still on fuses. Basement finishes, garage EV chargers and central air additions are frequent reasons to upgrade a service or add circuits.

