Furnace & AC cost calculator
Instant online HVAC estimate. Your exact price, right now.
Get an online HVAC estimate with your exact installed price in about a minute. Pick the job, your home size and the equipment, and the price narrows with every answer.
Build my quoteInstalled prices at FortHouse
- Furnace + AC
- $10,000–$17,000
- Central AC
- $5,000–$10,000
- Gas furnace
- $5,000–$9,000
- Heat pump
- $5,500–$10,000
Labor, materials, permit and removal of the old equipment included. Duct work, if needed, is quoted separately.
- No phone number needed
- Written price before any work
- Free in-home confirmation
- Open 24/7
Want modulating, variable-speed or communicating equipment? Those systems need a matched coil and thermostat, so we quote them one by one. Use the contact form or email comfort@forthousehvac.com.
Every price at a glance
FortHouse HVAC prices
Installed prices include removal of the old equipment and permit filing. Duct work, when a home needs it, is quoted separately and added to the installed price; it is not part of these ranges.
| Job | Price |
|---|---|
| Furnace and AC replacement togetherInstalled price for a complete new gas furnace and central air conditioner with a matched coil, including removal of the old equipment, permit filing, startup and commissioning. Some labor and setup overlap when both are done together. | $10,000–$17,000 |
| Central AC installation or replacementInstalled price for a new central air conditioner, including removal of the old unit, permit filing, startup and commissioning. Most installs take one day. | $5,000–$10,000 |
| Furnace installation or replacementInstalled price for a new gas furnace, including removal and disposal of the old furnace and permit filing. The new PVC venting a 95%+ furnace needs is included. | $5,000–$9,000 |
| Heat pump installationInstalled price for a ducted air-source heat pump, including removal of the old equipment, permit filing, startup and commissioning. | $5,500–$10,000 |
| Furnace or AC tune-upA furnace or AC tune-up is $119. The furnace tune-up is a 21-point inspection, including a heat exchanger check and carbon monoxide test, and takes 60–90 minutes. Any repair it finds is quoted before work starts. | $119 |
| Furnace or AC repairMost furnace and AC repairs, such as an ignitor, capacitor, flame sensor or fan motor, quoted in writing before any work. The diagnostic visit is $119 in regular hours. | $150–$600 |
From estimate to install
How the estimate works
- 1
Get your price here
Pick the job, your home size and the equipment. No phone number or email needed to see a price.
- 2
Book a free in-home visit
Choose an open time online. We measure the home and check the venting, electrical and ducts.
- 3
Get the exact number in writing
One written price before any work starts. Most installs take a single day.
How the calculator sizes and prices a system, with sample prices: read the HVAC cost calculator guide.
Questions
Online HVAC estimate questions
Still deciding? Call and talk it through with us, any hour.
(630) 318-6246Can I get an online HVAC estimate without a home visit?
Yes. Pick furnace + AC, furnace only or AC only, your above-ground square footage and the equipment you want, and the online HVAC estimate shows the installed price for the exact Goodman models sized for that home. A free in-home visit confirms the size and the price in writing before any work.
How much does a new furnace and AC cost?
A complete furnace and AC system runs $10,000–$17,000 installed at FortHouse Heating & Cooling. With the standard Goodman systems in this online estimate, a furnace and AC together are $10,000–$15,850, a furnace only $5,000–$7,100 and an AC only $5,800–$9,950, depending on home size and efficiency. The top of the full range is modulating and communicating equipment, which is quoted one system at a time.
Is this an HVAC cost calculator?
It works like one, with one difference: instead of a national average, it gives FortHouse's own installed price for the Goodman furnace, air conditioner and coil sized for your home. Labor, materials, permit and removal of the old equipment are in the number.
Is the in-home estimate free?
Yes. The in-home estimate for a new AC, furnace or heat pump is free, and the price is given in writing before any work starts.
Will the price change after the in-home visit?
The online price is for the system FortHouse would size for your square footage. The visit checks what a floor plan can't show, such as duct sizes, venting and electrical. If anything changes the price, you get the new number in writing before work starts.
Can I get a price on variable-speed or modulating equipment?
Yes. Modulating furnaces, variable-speed air conditioners and communicating systems need a matched coil and thermostat, so FortHouse quotes them one at a time. Send a note through the contact form or email and you get a written price.
Does the estimate include duct work?
Duct work, when a home needs it, is quoted separately and added to the installed price; it is not part of these ranges.
What does a tune-up or repair cost?
A furnace or AC tune-up is $119. Most furnace and AC repairs run $150–$600, quoted in writing before any work, and the diagnostic visit is $119 in regular hours.
Where does FortHouse give estimates?
FortHouse Heating & Cooling serves Plainfield, Naperville, Yorkville, Bolingbrook, Oswego, Wheaton, Lisle, Minooka, Shorewood, Aurora and Joliet, Illinois, and is open 24 hours a day, 7 days a week.
Prices updated November 2, 2026.
Rather talk it through? Get your estimate by phone
After hours? Call (630) 318-6246, answered 24/7.