Furnace and AC Replacement Cost Calculator
A furnace and AC replacement cost calculator adds equipment and labor per system: one system at $4,500 plus $2,000 labor comes to a $6,500 total.
Furnace and AC replacement cost calculator
A furnace and AC replacement cost calculator takes the number of systems you are replacing and adds two prices for each one: equipment and labor. One system with $4,500 of equipment and $2,000 of labor comes to $6,500. Enter your own quote figures and the total updates as you type.
The result is a budget number, not a bid. It covers the two lines you type in and nothing else, so it works best once you have at least one written quote to copy the numbers from.
The formula in plain words
Total = systems × equipment cost + systems × labor cost.
Equipment is everything you buy: furnace, condenser, indoor coil and usually a thermostat. Labor is the crew’s time to pull the old units, set the new ones, connect gas, power, refrigerant and drain, and start everything up. If you have two zones with separate equipment, count them as two systems.
Worked examples
One system, using the calculator defaults:
- Equipment: 1 × $4,500 = $4,500
- Labor: 1 × $2,000 = $2,000
- Total: $6,500
A two-zone house where each zone has its own furnace and AC. The equipment is bigger on the main floor, so use the average of the two quotes, say $5,200 equipment and $2,400 labor per system:
- Equipment: 2 × $5,200 = $10,400
- Labor: 2 × $2,400 = $4,800
- Total: $15,200
If the second zone is much smaller than the first, run the calculator twice with different numbers and add the results.
What shows up on a quote and what does not
| Quote line | Inside this calculator? | Where to put it |
|---|---|---|
| Furnace and AC equipment | Yes | Equipment field |
| Installation crew | Yes | Labor field |
| Thermostat | If bundled | Equipment field |
| Ductwork repair or sealing | No | Add afterward |
| Electrical circuit or breaker | No | Add afterward |
| Permit and inspection | No | Add afterward |
| Concrete pad or line set | No | Add afterward |
| Old equipment haul-away | Sometimes | Check the quote |
Local permit rules differ, and gas and refrigerant work normally needs a licensed HVAC contractor. Check what your city requires before you accept a bid.
How to get the two numbers
- Request three written quotes that each split equipment from labor.
- Ask for the brand, model number, tonnage and efficiency ratings so you can compare the same equipment.
- Average the equipment lines and average the labor lines, then type those into the calculator.
- Add the items from the table above that none of the quotes include.
If a contractor gives you only a single lump sum, ask for the split. Without it, enter the lump sum as equipment and set labor to zero. The total is the same, but you lose the ability to see how labor changes your budget.
Sizing matters more than the brand
A system that is too big short-cycles. It reaches the thermostat setting quickly, shuts off, and leaves humidity behind. One that is too small runs all day and still falls behind in a heat wave. Good contractors size from a load calculation of the house, not from the old unit’s label or from square footage alone.
Our furnace size calculator gives a rough range to compare against what a contractor proposes. It is a sanity check, and the contractor’s load calculation is the number to rely on.
Common mistakes
- Counting only the furnace price and forgetting the outdoor condenser and coil.
- Entering two zones as one system, which halves the total.
- Comparing a quote that includes ductwork to one that does not.
- Choosing the cheapest bid without checking that the efficiency rating matches the others.
- Skipping the permit. An unpermitted install can complicate a home sale or an insurance claim later.
Cheaper alternatives to consider
If one room or an addition is the problem, a ductless unit can cost far less than replacing a whole system. The mini split cost calculator prices that route. If you are choosing between a gas furnace and electric heat, the heat pump vs gas furnace calculator compares yearly running costs. A replacement project is also a good moment to think about backup power, which the whole house generator cost calculator covers.
Estimates only. Actual cost depends on your region, equipment, and site conditions. Get written quotes from licensed contractors before budgeting.
Frequently asked questions
Why replace a furnace and AC together instead of separately?
A single visit means the crew opens the plenum, refrigerant lines, thermostat wiring and power connections once. The furnace blower also moves air across the AC coil, so a new coil paired with a very old blower or the reverse can leave you with mismatched airflow. Installers also tend to warranty matched systems more readily.
What counts as one system in this calculator?
One system is one furnace and the air conditioner that shares its ductwork. A two-story house with an upstairs furnace and AC plus a basement furnace and AC has two systems, so enter 2. A house with one furnace and one AC is 1.
Does this include ductwork or electrical upgrades?
No. The total is only the equipment price you enter plus the labor price you enter, each multiplied by the number of systems. Duct repair, a new circuit or panel work, permits, a new pad or line set, and old-equipment disposal are separate lines on a real quote, so add them to the equipment or labor field if your contractor bundles them.
What should the equipment number include?
Put in the furnace, the outdoor condenser, the indoor coil and the thermostat if they are priced as one package. If your quote lists the furnace and the AC separately, add them together first and enter the sum as the per-system equipment cost.
How many quotes should I collect?
Three itemized quotes is a practical number. Ask each contractor to size the equipment with a written load calculation and to list brand, model, efficiency rating and labor on separate lines, so you compare the same scope and not just the bottom number.
Estimates only. Verify quantities with your supplier before purchasing.