💰 Total Installed Cost
📊 Annual Operating Cost
Cost Breakdown
Full Cost Table
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How to Use the Furnace Cost Calculator
Choose the fuel source, since it affects both equipment pricing and any venting or fuel supply work needed.
Choose the furnace output in BTU/hr that matches the home's heating load, ideally confirmed by a proper heat loss calculation.
Choose standard-efficiency or high-efficiency condensing AFUE to see the cost and efficiency tradeoff.
Click Calculate Installed Cost to see equipment cost, labour cost, total installed cost, and estimated annual operating cost.
What Drives Furnace Installed Cost
Furnace pricing breaks down into equipment cost, which scales with output size and efficiency tier, and labour cost, which depends on the installation's complexity. Fuel type affects equipment pricing directly and can also introduce fuel-specific work, like propane tank considerations or oil supply line checks, beyond the furnace itself.
The AFUE Efficiency Tradeoff
Annual Fuel Utilization Efficiency, or AFUE, measures what share of the fuel's energy actually becomes usable heat over a typical year. A standard 80 percent AFUE furnace loses about a fifth of its fuel energy through the flue and other inefficiencies, while a 96 percent or higher AFUE condensing furnace extracts nearly all of it. That efficiency jump comes from a secondary heat exchanger that cools the exhaust gases enough to condense moisture out of them, which is also why condensing furnaces need different, cooler-running venting than standard models.
Why High-Efficiency Furnaces Cost More to Install
Beyond the equipment premium itself, a condensing furnace's cooler exhaust temperature means it can't safely use a home's existing metal chimney, which was designed for the higher temperatures a standard-efficiency furnace produces. Installing a high-efficiency furnace typically means running new sidewall PVC or polypropylene venting along with a condensate drain, both of which add labour and material cost that a standard-efficiency replacement using the existing chimney can often skip.
Sizing Matters More Than Marketing
A furnace sized larger than the home actually needs doesn't heat any faster in any meaningful sense; it just cycles on and off more often, which wastes energy and adds wear to the blower and heat exchanger over time. Confirming the home's actual heat loss, rather than assuming bigger is safer, keeps both the upfront cost and the long-term operating cost in check.
Comparing Against Other Heating Options
If the home is also a candidate for a heat pump, either as full replacement or as a complementary hybrid system, compare the numbers here against the heat pump cost calculator and the heat pump vs furnace cost calculator.
Frequently Asked Questions
A standard-efficiency gas furnace typically runs from around $3,500 to $5,500 installed for a common residential output size, while a high-efficiency condensing furnace often runs from $5,500 to $9,000 or more once venting changes are included. Propane and oil furnaces tend to cost somewhat more than gas due to fuel-specific equipment and supply considerations.
AFUE measures what percentage of fuel energy the furnace converts into usable heat over a typical year, with the rest lost through the flue or other inefficiencies. An 80 percent AFUE furnace loses about 20 percent of its fuel energy, while a 96 percent AFUE condensing furnace loses only about 4 percent, extracting extra heat from the flue gases before they vent, which requires different, typically sidewall, venting than a standard-efficiency model.
A high-efficiency condensing furnace cools the exhaust gases enough to extract extra heat, which means the exhaust temperature is too low to safely use a traditional metal chimney designed for hot flue gases. Condensing furnaces vent instead through sidewall PVC or polypropylene piping along with a condensate drain, which adds installation cost compared to reusing an existing chimney with a standard-efficiency furnace.
No. An oversized furnace short-cycles, turning on and off more frequently than a properly sized unit, which wastes energy, causes uneven temperatures, and adds wear to components over time. Furnace size should match the home's actual heat loss rather than defaulting to the largest available unit for the coldest possible day.
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