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Chicago splits between large apartment buildings and detached houses with a deep layer of two- to four-flats in between: 26% of its 1,277,054 housing units are single-family detached, 4% attached, 27% in two- to four-unit buildings and 43% in buildings of five or more (Census ACS 2020-2024, table B25024, https://data.census.gov/table/ACSDT5Y2024.B25024?g=160XX00US1714000, checked 2026-10-20), 75% of those units were built before 1980 and 39% before 1940 (Census ACS 2020-2024, table B25034, https://data.census.gov/table/ACSDT5Y2024.B25034?g=160XX00US1714000, checked 2026-10-20), and of the 1,160,205 occupied homes natural gas heats 78%, electricity 18%, oil is nearly absent and propane 2% (Census ACS 2020-2024, table B25040, https://data.census.gov/table/ACSDT5Y2024.B25040?g=160XX00US1714000, checked 2026-10-20). Gas dominates every neighborhood, so the Chicago job is almost always a gas-furnace replacement or a gas-boiler complement, never an oil-tank removal. The two- to four-flat stock that lines the side streets of Logan Square, Pilsen and Bridgeport is the signature install: one small outdoor unit per floor, a dedicated circuit per head, and the condo association or landlord signing off on the condenser location before the permit application, because the city requires a zoning review for any exterior mechanical equipment on a multi-unit building. On the bungalow belt from Portage Park through Clearing, the houses already have ducts and a single outdoor unit on a pad beside the gangway fits the lot, so the quote there is a conventional ducted swap and the rebate paperwork is simpler than the multi-head jobs closer to the lake.
Greystone two-flats and brick bungalows from 1910 to 1940 were built on a basement boiler and a single steam main. Peoples Gas still feeds a lot of those fireboxes. A ductless heat pump can take the parlor and the bedrooms without opening the plaster.
Lincoln Park, Lakeview Chicago, Wicker Park, Logan Square, Pilsen, Hyde Park Chicago, South Loop, West Loop, Andersonville, Rogers Park, Humboldt Park, Bucktown.
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