An unfinished basement containing a forced-air furnace with metal ductwork, exposed wooden ceiling joists, a hanging Edison bulb, and bare concrete floors.

Furnace vs Boiler in Peoria County, Illinois

When a furnace makes sense

If your house already has ductwork, a furnace is the straightforward choice. It heats through those same ducts, and with eight months of heating a year and nights averaging 20°F, you want a system that matches what your home is set up for. That's most houses in this county.

When a boiler makes sense

A boiler makes sense if your home heats through radiators or in-floor pipes rather than ducts. It runs about 5% cheaper here than a furnace, which matters over an eight-month heating season with nights near 20°F. If your house was never fitted for ductwork, this is the machine built for what you already have.

When a furnace makes sense

If your house already has ductwork, a furnace is the straightforward choice. It heats through those same ducts, and with eight months of heating a year and nights averaging 20°F, you want a system that matches what your home is set up for. That's most houses in this county.

When a boiler makes sense

A boiler makes sense if your home heats through radiators or in-floor pipes rather than ducts. It runs about 5% cheaper here than a furnace, which matters over an eight-month heating season with nights near 20°F. If your house was never fitted for ductwork, this is the machine built for what you already have.

An unfinished concrete basement containing a metal HVAC air handler, exposed wooden ceiling joists with sheet-metal ducts, a hanging bare bulb, copper pipes, and stacked cardboard boxes.

Furnace

Runs on
Natural gas
What it does
Heats only
Tax credit
No federal tax credit since the end of 2025

Sources: U.S. Department of Energy · Internal Revenue Code

A gray metal boiler with a pressure gauge and piping installed in an unfinished stone-walled basement.

Boiler

Runs on
Natural gas
What it does
Heats only
Tax credit
No federal tax credit since the end of 2025

Sources: U.S. Department of Energy · Internal Revenue Code

Furnace wins in Peoria County.

In the Great Lakes states, 78.8% of homes heat with a furnace, so most already have the ductwork it needs.

About 5% lessto heat with a boiler than with a furnace, at Illinois prices
20°Faverage winter low
68%of homes here heat with gas

If your home already has radiators or in-floor pipes instead of ductwork, a boiler is still the better choice.

Find a contractor
Compared onFurnaceBoiler
Cost to run hereCosts more to runAbout 5% less to run
What it doesHeats onlyHeats only
Homes in the Great Lakes states that heat with one78.8%7.7%
Handles a 20°F nightYesYes

Sources: U.S. Energy Information Administration, U.S. Department of Energy, NOAA

When a furnace makes sense

If your house already has ductwork, a furnace is the straightforward choice. It heats through those same ducts, and with eight months of heating a year and nights averaging 20°F, you want a system that matches what your home is set up for. That's most houses in this county.

When a boiler makes sense

A boiler makes sense if your home heats through radiators or in-floor pipes rather than ducts. It runs about 5% cheaper here than a furnace, which matters over an eight-month heating season with nights near 20°F. If your house was never fitted for ductwork, this is the machine built for what you already have.

A Peoria County contractor will price both against your own house, your ductwork and your panel.

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