How much does AC and furnace replacement cost together?
Replacing an AC and furnace together often costs $8,000 - $20,000+ installed for a matched split system. Smaller homes with standard-efficiency equipment may land near the lower end; high-efficiency equipment, difficult access, duct corrections, or electrical/gas code work can push the total higher.
The combined quote should identify the outdoor condenser, indoor coil, furnace, thermostat, efficiency ratings, permit, removal, warranty, and any duct or venting changes.
What changes the combined system price
Basic matched AC and furnace replacement
$8,000 - $14,000How to tellSame duct layout, accessible equipment, standard-efficiency AC, and 80% furnace
The fixReplace condenser, coil, furnace, thermostat connections, pad/disconnect as needed, and test charge/airflow
Higher-efficiency AC or furnace
$11,000 - $18,000+How to tellSEER2 upgrade, variable-speed blower, two-stage furnace, or 90%+ condensing furnace
The fixConfirm energy savings, venting, condensate drain, rebate eligibility, and warranty value
Ductwork or airflow corrections
$500 - $5,000+ extraHow to tellHot and cold rooms, noisy returns, weak airflow, undersized ducts, or poor filter setup
The fixAdd returns, resize transitions, seal ducts, correct static pressure, or rebalance
Venting, gas, or electrical updates
$300 - $3,000+ extraHow to tellOld furnace venting, unsafe flue, weak disconnect, old breaker, or code issues
The fixInclude code corrections in the estimate instead of treating them as surprises
Emergency replacement
Often higherHow to tellNo cooling or no heat and the old system is beyond practical repair
The fixAsk for a complete written scope even if timing is urgent
Before replacing both pieces
- Ask whether both the AC and furnace are near end of life. Replacing both can make sense, but a newer working furnace does not always need to go.
- Ask for model numbers and efficiency ratings for the condenser, coil, and furnace.
- Confirm the indoor coil and outdoor unit are matched and that the furnace blower can support the airflow.
- Ask whether the quote includes permit, disposal, condensate, thermostat, warranty registration, and rebate paperwork.
- Compare against the broader HVAC replacement cost guide if the quote includes heat-pump or dual-fuel options.
Unlock the hiring checklist
Use this before you call an hvac, so you know what to ask and what to avoid.
When replacing both is more likely to make sense
- Both systems are 12-15+ years old
- The AC repair requires a major compressor or coil and the furnace is also aging
- The old furnace blower is not compatible with the new cooling equipment
- You want one matched warranty and one installation event
- Current comfort problems involve airflow, humidity, and heating/cooling performance
Bundled replacement is not automatically cheaper
Replacing AC and furnace together can reduce duplicate labor and make equipment matching cleaner. It is still a large project, so compare the value of one matched system against replacing only the failed side. If one component is much newer, ask the contractor to explain why it must be replaced now.
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Related questions
Is it cheaper to replace AC and furnace at the same time?
Often yes compared with two separate projects, because labor, permit handling, transitions, thermostat setup, and warranty registration can be combined. It is not cheaper if the furnace is still newer and compatible.
Can I replace my AC without replacing the furnace?
Sometimes. The furnace blower and indoor coil must be compatible with the new outdoor unit. If the furnace is old or airflow is poor, replacing only the AC may be a short-term fix.
How long does AC and furnace replacement take?
Many straightforward replacements take one day. Duct changes, attic/crawlspace access, electrical corrections, or high-efficiency venting can add time.
Should I finance AC and furnace replacement?
Financing can help with an urgent replacement, but compare the cash price, interest rate, promotional terms, and total repayment cost before using a monthly payment to judge affordability.