New HVAC System Cost Guide for Chicago in 2026: Furnace, AC, and Heat Pump Price Ranges

7 days ago

4 min read

A new furnace in the Chicago area typically installs for a few thousand dollars, a central air conditioner runs somewhat more, and a full furnace-and-AC replacement done together generally costs less than doing each separately at different times — mainly because ductwork, electrical, and labor overlap between the two projects. An air-source heat pump sits at the higher end of the range, since it usually replaces both a furnace and an AC in one piece of equipment. None of these are fixed prices: house size, ductwork condition, equipment efficiency tier, and whether the job is a straightforward swap or requires modification all move the number.

What actually determines the price of your specific job

Equipment efficiency tier. A baseline 80 percent AFUE furnace costs less than a 96-97 percent modulating unit; the higher tier costs more upfront and less to operate over time.
Capacity and sizing. A correctly sized system for your home's actual heat loss and heat gain — from a real load calculation, not a square-footage rule of thumb — may cost more or less than what a previous, possibly incorrectly sized system suggests.
Ductwork condition. A straightforward swap onto existing, adequate ductwork costs less than a job that requires duct modification, sealing, or replacement to handle a new system properly.
Electrical requirements. Heat pumps and higher-efficiency equipment sometimes require electrical panel or circuit upgrades that a straightforward furnace swap doesn't.
Removal and disposal of the old equipment, including proper refrigerant reclamation for AC and heat pump systems.

Furnace-only replacement

A gas furnace replacement is generally the least expensive of the three categories, particularly when it's a like-for-like swap using existing ductwork and venting. Moving from an 80 percent AFUE furnace to a 96 percent unit changes the venting requirements — high-efficiency furnaces vent through PVC pipe rather than metal flue, which is a straightforward change on most jobs but adds a line item worth knowing about upfront rather than as a surprise.

Central air conditioner replacement

AC-only replacement costs depend heavily on whether the existing furnace's air handler and coil are compatible with the new outdoor condenser — mismatched systems lose efficiency and can void manufacturer warranties. Refrigerant type matters too: R-22 systems being replaced generally cost more in disposal and reclamation than modern R-410A or R-32 systems, since R-22 was phased out of production and is increasingly expensive and scarce.

Combined furnace and AC replacement

Replacing both systems in one project is usually more cost-effective than replacing them years apart, because labor, electrical work, and any duct modifications happen once instead of twice, and a matched furnace-and-AC pairing is engineered to work together rather than an old furnace paired with a new coil sized for different airflow. This is also the scenario where installing a mismatched system — old furnace, new higher-efficiency AC, or vice versa — most commonly causes problems down the line.

Heat pumps: the newer option for Chicago

An air-source heat pump replaces both heating and cooling functions in one system, which puts its installed cost above a furnace-only or AC-only job but often below the combined cost of replacing both separately with high-efficiency equipment. Cold-climate heat pumps now maintain rated capacity into single-digit temperatures, but most Chicago installations still pair a heat pump with gas furnace backup for the coldest days — a "dual fuel" configuration — rather than relying on the heat pump alone through the entire winter.

Financing the cost, honestly

The federal 25C tax credit that used to offset furnace, AC, and heat pump purchases ended for equipment installed after December 31, 2025. Utility rebates through Nicor Gas and ComEd remain available and change annually — confirm current amounts before finalizing a quote. Every complete installation from CCC Mechanical also includes a free Honeywell T5 smart thermostat and a free Aprilaire whole-home humidifier, which offsets part of the total project cost without requiring separate paperwork.

Key takeaways

Furnace-only replacement is generally the least expensive category; AC-only and combined furnace-and-AC replacement cost more, with combined projects usually cheaper than doing both separately over time.
Heat pumps cost more upfront than a furnace alone but replace both heating and cooling in one system, and most Chicago installs pair them with gas furnace backup.
Equipment efficiency tier, ductwork condition, electrical requirements, and old-equipment disposal all move the final number more than house size alone.
The federal 25C tax credit ended after 2025; Nicor Gas and ComEd utility rebates remain the available incentives for 2026.

Frequently asked questions

Is it cheaper to replace my furnace and AC at the same time?

Usually, yes, relative to replacing them years apart — labor, electrical work, and duct modifications happen once instead of twice, and a matched system avoids the efficiency losses of pairing mismatched equipment.

Are heat pumps more expensive than furnaces in Chicago?

Installed cost is generally higher than a furnace-only replacement, since a heat pump replaces both heating and cooling. Compared to replacing a furnace and AC separately, a heat pump can be cost-competitive, especially when paired with gas backup for the coldest days.

What's included with a new system from CCC Mechanical?

Every complete furnace or AC installation includes a free Honeywell T5 WiFi thermostat and a free Aprilaire whole-home humidifier, both installed and configured — see the promotions page for current details.

Does CCC Mechanical serve my area in Chicagoland?

CCC Mechanical LLC serves homeowners and businesses across Chicago, Arlington Heights, Buffalo Grove, Elmwood Park, Melrose Park, Niles, and Northbrook. Call 630-827-9024 to confirm service at your address.

Ready for a specific quote instead of a general range? Call 630-827-9024. We'll run a real load calculation on your home before recommending equipment. Every complete installation includes a free Honeywell T5 smart thermostat and a free Aprilaire whole-home humidifier — see the promotions page.