Ferguson ranks among north St. Louis County's bigger municipalities, roughly 18,200 people across six square miles northwest of downtown (about eight miles away). Postwar construction defines it; Census data puts typical build year at 1957. Seventy-one percent of residences stand alone as single-family houses, while 6% belong to complexes of ten-plus units. Among 8,100 occupied homes, natural gas warms 80% and electricity 17%.
Five factors in a Ferguson furnace estimate
| Factor | Local relevance |
|---|---|
| Flue | Brick chimneys served most original 1950s burners. Switching to condensing technology means fresh PVC piping out a wall; any gas water heater sharing that chimney might then require relining. |
| Placement | Basements make swaps routine. Slab-on-grade ranches with cramped hall closets demand extra maneuvering. |
| Air distribution | Seven-decade-old sheet metal leaks at seams; returns are frequently undersized for modern blowers. |
| AFUE tier | 80% models, 95%+ single-stage, two-stage, fully modulating: each gas furnace class carries distinct hardware and controls. |
| Cooling tie-in | Corroded evaporator coils, or interest in a heat pump, can fold into one project. |
Why we skip posted prices
Mix those variables across thousands of distinct Ferguson houses and any "average" misleads more than it helps. Real numbers follow a conversation about your property.
Tenants
Renting? Replacement authority rests with property owners. Forward them this page.
Seller
Furnace Direct, a DBA of Hamlin Mechanical LLC, moves equipment from factory to doorstep. North County appointments originate from our St. Louis hub.
Calendar
January breakdowns force rushed decisions. September through October offers breathing room for side-by-side bids.
First step
Locate the rating plate, write down model plus approximate install year, then ring (888) 762-1334 and Call for Pricing.
Ferguson numbers: five-year ACS through 2024, published by Census Reporter.
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Tell us a little about your home and what you're replacing. A specialist will call you to work out exactly what you need, go over the price, and get it replaced. No obligation.