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Lemay MO Furnace Installation Cost Guide

Published October 27, 2026· Last updated November 2, 2026· 1 min read
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Lemay is an unincorporated community in south St. Louis County, tucked between the city limits and the Mississippi, roughly seven miles south of the Arch. About 16,200 people occupy its four-odd square miles. It is an older place; half of its homes were built by 1955. Freestanding single-family residences make up 78%, while big apartment buildings hold just 4%.

No posted price, here's why

We price Lemay furnace replacements per house. A 70-year-old home can hide a lot behind the basement wall, and these are the items that change the work:

The flue

Older units usually exhaust up a clay-tile masonry stack. A condensing replacement instead needs plastic pipe out through a wall or rim joist, and the tank heater that stays on the stack may need lining.

Basement access

Narrow stairs, low ceilings, and tight corners make removal and setting harder in some Lemay basements.

Ductwork from different eras

Homes this age may have converted gravity-furnace ducts, large round pipes, or a mix of patched sections. Adapting a new gas furnace to that system can take custom transitions.

Electrical and gas lines

A dedicated circuit, a new shutoff valve, or a resized gas line may be needed.

Adding cooling at the same time

If the home has no central AC, installing a coil and condenser alongside the furnace adds scope but saves a second trip.

Electric alternatives

Electric resistance warms roughly 19% of Lemay's 6,240 households (gas covers 79%). That group can weigh heat-pump equipment instead.

The seller

Our St. Louis team handles Lemay. Units are sold by Furnace Direct, a DBA of Hamlin Mechanical LLC, at factory-direct terms.

Timing and contact

Late summer through early fall is the best window, before the heating season fills calendars. Text-ready photos help: furnace label, chimney connection, stairway. Call for Pricing: (888) 762-1334.

Lemay CDP estimates are from the five-year American Community Survey ending 2024; see Census Reporter.

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