Furnace Replacement Cost in Denver, CO
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- $13,000Dec 2025reddit Dec 2025 ↗
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“I just had to replace my furnace and with electrical and gas lone updates everything was about $13k”
- $9,000Dec 2025reddit Dec 2025 ↗
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“Got a new furnace from Brothers Plumbing Heating & Electric two years ago, cost about $9k including installation. My house is roughly 1500 sq ft.”
What drives the price of Furnace Replacement
Heating capacity, fuel type, AFUE rating, and blower design decide what a new furnace costs. A single-stage gas furnace is simpler than a two-stage or modulating unit with a variable-speed blower. Converting from electric to gas, changing fuel type, resizing the gas line, or fitting equipment into a crawlspace or attic adds work. The furnace must also match the home's heating load and, when central air shares the cabinet, the existing coil and airflow requirements.
Two quotes often diverge because venting is treated differently. A standard-efficiency gas furnace may use a metal flue, while a condensing furnace needs compatible intake and exhaust piping plus a condensate drain. Chimney liners, return-air modifications, filter cabinets, thermostats, permits, and removal of the old unit may be included in one proposal and omitted from another.