How long does it take to install a new furnace and AC?
The install itself usually takes about one day. Carrier puts a standard HVAC replacement at 4 to 10 hours, and up to two or three days when the job needs extensive ductwork changes, structural changes, or zoning.
How long does the whole process take, start to finish?
Most of the wait comes before install day: getting quotes, choosing a contractor, and getting on their schedule.
Trane's homeowner guide breaks an AC replacement into five phases and says the whole process can take a few days or up to two weeks, depending on how quickly you decide and schedule:
1. Research: a day or two, up to a week or two 2. Getting quotes: 1 to 3 days 3. Comparing quotes and choosing a contractor: 1 to 3 days 4. Scheduling the install: 1 to 3 days, and sometimes the next day 5. Install day: 4 to 8 hours on average for an AC
Trane also notes that in the middle of summer you may not be able to line up several quotes as quickly as in spring or fall. Carrier says off-season scheduling often means faster appointments.
How long does install day take?
The two manufacturer guides we checked give similar numbers:
Install day usually means removing the old equipment, setting the new furnace and outdoor unit, connecting refrigerant lines, gas, venting, and power, then testing the system and showing you the thermostat and filter.
- Trane (AC install): 4 to 8 hours on average, longer if extra work is needed.
- Carrier (full HVAC replacement): typically one full day, 4 to 10 hours. Extensive ductwork changes, structural changes, or zoning can push it to two or three days.
What makes an HVAC install take longer?
Ask the contractor how many days they expect your job to take and why.
- Ductwork changes. Sealing, resizing, or adding ducts adds time.
- New venting. A new furnace may need new vent pipes through a wall or roof.
- Electrical updates. Some outdoor units or heat pumps need electrical work.
- Tight access. A furnace in a crawlspace, attic, or finished basement can take longer to swap.
- Changing system type. Adding a heat pump or zoning is more work than a like-for-like swap.
How do permits and inspections fit in Omaha?
The City of Omaha issues mechanical permits for residential furnace and AC replacements, and the contractor normally pulls it. Carrier notes that permits, electrical work, and structural changes can affect installation time. A city inspection normally follows the work. Ask the contractor when it will happen and whether you need to be home.
What if my furnace died and I need heat now?
Don't wait for a full replacement plan if the house is getting cold. A no-heat call may turn out to be a repair. When you request help, pick "No heat or weak heat" and choose Today for how soon you need help. Same-day help depends on the contractor's schedule. If you pick Today, we mark it urgent and work on it as quickly as we can. See urgent HVAC help in Omaha and furnace repair in Omaha. If you have heat but it's struggling, you have more time to compare quotes.
Even in a rush, ask for a written, itemized quote before work starts.
Safety first. If you smell gas, leave the house and call 911 and your gas utility from outside. For M.U.D. customers, the 24/7 emergency line is 402.554.7777. In Council Bluffs, the gas utility is MidAmerican Energy. If a CO alarm goes off or anyone feels sick, dizzy, or flu-like, get everyone outside and call 911.
How do I get ready for install day?
- Clear a path to the furnace and the outdoor unit. Carrier says homeowners should clear access to existing equipment.
- Move stored items away from the furnace area.
- Plan for the heat or AC to be off for most of the day.
- Keep pets and kids away from the work area.
- Write down questions about the thermostat and filter for the walkthrough.
What should I do after the install?
1. Get the paperwork. Model and serial numbers, the AHRI certificate, the paid invoice, and the permit number. 2. Register the warranty. Some manufacturers require registration within a set window to get their longer warranty options. Carrier says to register within 90 days of installation. Lennox uses 60 days for existing homes. Ask the contractor who registers it, then confirm it's done. 3. Apply for your rebate. OPPD's HVAC Smart rebate must be applied for within 4 months of install and in the same calendar year. MidAmerican's 2026 discounts in Council Bluffs are instant through participating providers. 4. Change the filter on schedule. Ask what size it takes and how often.
Sources
- How Long Does It Take to Install an AC Unit? (Trane)
- What is an HVAC Replacement? Step-by-Step Guide (Carrier)
- Home HVAC Warranty Registration and Coverage (Carrier)
- Can Equipment Be Registered After 60 Days from the Installation or Closing Date? (Lennox)
- Weekly Report of Mechanical Permits Issued, Sept. 5 to 11, 2022 (City of Omaha, via Omaha Daily Record)
- FAQ: Will the electrical, mechanical, and plumbing work be approved under my residential building permit? (City of Omaha Planning Department)
- HVAC Smart Rebates (OPPD)
- Home Discounts and Rebates (MidAmerican Energy)
- Metropolitan Utilities District, 24/7 emergency line 402.554.7777 (M.U.D.)
Common questions
How long does it take to install a new furnace and AC?
Usually about one day. Carrier says a standard HVAC replacement typically takes 4 to 10 hours, and up to two or three days if extensive ductwork, structural changes, or zoning are needed.
How long does AC installation take?
Trane says the install itself averages 4 to 8 hours. The full process, from research and quotes to install, can take a few days to two weeks.
Can I get a new furnace installed today?
Same-day help depends on the contractor's schedule. If you pick Today on the form, we mark it urgent and work on it as quickly as we can.
Do I need to be home during an HVAC install?
Plan to be available at the start and end so the crew can get access and walk you through the new system. Ask the contractor about the city inspection too.
When do I need to register my new HVAC warranty?
It depends on the brand. Carrier says to register within 90 days of installation to choose its warranty options. Lennox uses 60 days for existing homes. Ask the contractor who registers it.