Cooling
AC installation and replacement
A new central air conditioner should be sized with a load calculation (Manual J), matched to the indoor coil, and installed with the refrigerant charge verified by measurement. Getting those three things right matters more for comfort and power bills than the brand on the box.
- Licensed local HVAC contractor
- Diagnosis and price before work
- Same-day appointments when a local contractor has an opening
- Free to call, no obligation
Most replacements happen when an older system needs an expensive repair or still runs on R-22 refrigerant. Since 2023 new systems are rated in SEER2, and the federal minimum depends on your region: higher in the South and Southwest than in the North.
A good installer looks at more than the old unit's tonnage. They check duct size and leakage, the electrical circuit, the condensate route and whether a heat pump would serve you better than a straight AC.
AC Installation & Replacement at a glance
- Category
- Cooling
- Urgent service
- Usually scheduled
- Who does the work
- An independent, licensed HVAC contractor
- Quote
- Given after diagnosis, before work starts
Signs you need ac installation & replacement
- Repair quote above a third of the cost of a new system
- System older than 12–15 years or using R-22
- Rooms that never reach the set temperature
- Rising summer power bills with the same use
- Frequent repairs in the last two seasons
What the technician does
- 1
Load calculation
Square footage alone isn't enough. Windows, insulation, orientation and duct location set the right size.
- 2
Equipment options
Expect two or three choices across efficiency levels, plus whether a heat pump is a fit for your climate.
- 3
Installation
Old equipment and refrigerant are recovered, line set flushed or replaced, pad leveled and the coil matched.
- 4
Start-up and permit
Charge is set by superheat or subcooling, airflow verified, and the local mechanical permit is inspected where required.
What affects the cost
Prices are set by the contractor after diagnosis. These are the factors that move the number most:
- System size (tonnage) and efficiency (SEER2)
- Whether the indoor coil and furnace are replaced too
- Ductwork changes or repairs
- Electrical upgrades, line set and pad replacement
- Local permit fees and available utility rebates or tax credits
Safe to check yourself
- Gather your utility bills and note rooms that run hot
- Check for utility rebates before signing
- Ask each bidder whether they perform a load calculation
Leave to a pro
- Buying equipment online to have someone install (warranties often require a licensed installer)
- Handling refrigerant, which requires EPA Section 608 certification
AC Installation & Replacement FAQ
What size AC do I need?
Size should come from a Manual J load calculation, not a rule of thumb. An oversized unit short-cycles and leaves the house clammy; an undersized one runs constantly on hot days.
How long does AC replacement take?
A straight swap is usually done in one day. Adding ductwork, moving the unit or upgrading electrical can push it to two days.
Is a heat pump better than a new AC?
A heat pump cools exactly like an air conditioner and also heats. In mild and mixed climates it often lowers total energy costs; in very cold areas pair it with a cold-climate model or a furnace backup.
What does SEER2 mean?
SEER2 is the federal efficiency rating for air conditioners and heat pumps, introduced in 2023 with tougher testing conditions than the old SEER rating. Higher numbers mean lower operating cost for the same cooling.
Do I need to replace the indoor coil with a new AC?
Usually, yes. The indoor coil must be matched to the outdoor unit for the rated efficiency and warranty, and older coils may not be compatible with newer refrigerants.
What refrigerant do new AC systems use?
New systems are moving to lower-impact refrigerants such as R-454B and R-32 under federal rules that phase down R-410A in new equipment. Your installer should explain which one your system uses.
Can I install a new AC in winter?
Yes. Installers can set the refrigerant charge in cooler weather using manufacturer procedures, and off-season scheduling is often easier.
Are there tax credits for a new AC?
Some high-efficiency air conditioners and heat pumps have qualified for federal tax credits, and many utilities offer rebates. Rules change, so check current requirements before buying.
Last reviewed . General information, not a diagnosis of your system.
Popular cities for ac installation & replacement
Get ac installation & replacement from a local pro
One call connects you with an independent, licensed HVAC contractor who serves your ZIP code. It's free to call, and you get a quote before any work starts.
Free · No obligation