Chicago's location on Lake Michigan creates wind patterns that wreak havoc on furnace venting. Cold air funnels down chimneys and blows out pilot flames, especially in older homes with natural draft systems. When temperatures drop 30 degrees overnight, the metal components in your pilot assembly contract and expand rapidly. This thermal cycling loosens connections, warps thermocouples, and creates gaps where air infiltrates the combustion chamber. Homes near the lake or in high-rise buildings experience stronger drafts that make pilot lights unstable.
Chicago's building code requires specific venting standards, but many older furnaces were installed before current regulations took effect. Two-flats and multi-unit buildings often share chimneys, which complicates draft dynamics. We know how these systems work because we service them every day. Our technicians understand the difference between negative pressure issues and component failure. When you call Five Star HVAC Chicago, you get someone who knows Chicago heating systems inside and out, not a generic contractor reading a manual.
