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Serving all of Oahu Split, central & condo AC Book online any time

Oahu · Honolulu · Island-wide

AC Installation & Replacement on Oahu

A new air conditioner is a big decision, and on Oahu the right system can save you money every single month. Universal Air Hawaii sizes, installs and replaces split AC, central and window/wall systems for homes across Honolulu and the island.

(808) 400-6593
Limited-time offer Ends Jun 30, 2027

Hawaii Energy Instant Rebate Per Split AC Outdoor Unit

UP TO $550

Hawaii Energy instant rebates on qualifying high-efficiency split AC systems installed by a Clean Energy Ally contractor. Counted per outdoor unit, so separate single-zone systems can each earn one.

Code: REBATE550

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Quick answer

AC Installation: the short version

3 key points
  • Typical fully installed split AC price on Oahu: $3,500–$7,500 for a single zone, $7,000–$11,000 for 2 zones and $10,000–$15,000 for 3-4 zones. These are island-wide market ranges, not a quote for your home.
  • Hawaii Energy instant rebate: $400-$550 per outdoor unit (condenser) on a qualifying split AC or mini-split, set by size and efficiency and taken off the invoice. A 9,000 or 12,000 BTU unit earns $450 if it is rated 17.2 SEER2 or better, and nothing below that. The work must be done by a Hawaii Energy Clean Energy Ally contractor.
  • Oahu electricity runs about 43¢ per kWh, 2.3× the U.S. average. A new 12,000 BTU inverter split used 8 hours a day costs about $62 a month; an older unit of the same size draws about twice as much, about $124 a month.
Need it sorted for your home? Call or text (808) 400-6593.

Why Oahu homeowners call us first

  • Room-by-room load calculation, not a rule of thumb
  • Split AC, central and window/wall options compared
  • Help claiming instant Hawaii Energy rebates
  • Permits handled when required
  • Clean, careful install with a full walkthrough
  • Written quote with equipment, labor and rebates line by line
Current specials

AC Installation specials

Hawaii Energy Instant Rebate Per Split AC Outdoor Unit

Ends Jun 30, 2027
UP TO $550

Hawaii Energy instant rebates on qualifying high-efficiency split AC systems installed by a Clean Energy Ally contractor. Counted per outdoor unit, so separate single-zone systems can each earn one.

*$400 to $550 per qualifying outdoor unit (condenser), set by size and SEER2. A 9,000 or 12,000 BTU unit earns $450 if rated 17.2 SEER2 or better, and nothing below that; $550 is for units of 30,000 BTU and up. Counted per condenser, so three single-zone systems can earn three rebates while one multi-zone system earns one. Newly constructed homes do not qualify; newly purchased homes do. Must be installed by a Hawaii Energy Clean Energy Ally. Requires a Hawaiian Electric account. First-come, first-served while program funds last; program year ends June 30, 2027.

Code REBATE550

Free Second Opinion on Replacement Quotes

Ends Jun 30, 2027
FREE

Got a quote to replace your AC? We will take a second look at no charge and tell you straight whether a repair makes more sense.

*Requires a written replacement quote from another licensed Hawaii contractor. Residential systems on Oahu. One per household. We will tell you honestly if a repair makes more sense than a replacement, even if that means no sale for us.

Code 2NDLOOK

Hawaii Energy Pays $75 Toward Your AC Tune-Up

Ends Jun 30, 2027
$75 BACK

Hawaii Energy pays a $75 instant rebate on a qualifying AC tune-up performed by a Clean Energy Ally, up to two condensers per year. Ask us whether your visit qualifies.

*Hawaii Energy instant rebate of $75 per qualifying condenser, up to 2 per year per residence. The multi-point tune-up must be performed by a Hawaii Energy Clean Energy Ally. Requires a Hawaiian Electric account; Kauai (KIUC) is not eligible. First-come, first-served while program funds last. Program year runs through June 30, 2027. We confirm your eligibility before the visit.

Code TUNEUP75
Compare your options

Good, better, best: find the right fit for your home

Good

Dependable cooling at a lower upfront cost, sized correctly for your space.

  • Efficient system that meets current federal standards
  • Right-sized from a load calculation
  • Standard controls
  • Solid choice for rentals or rooms you use less
What to expect

Five simple steps from hot to cool

  1. 1

    Book online or call

    Send your request in under a minute, any time of day.

  2. 2

    A real person follows up

    A real person from our team calls you to set a time that works for you.

  3. 3

    Visit confirmed

    We confirm your arrival window before your visit.

  4. 4

    Diagnosis and price

    Your tech explains what's wrong and the price before any work begins.

  5. 5

    Cool again

    We finish the work, test the system and clean up before we leave.

AC installation on Oahu, built around how you live

Oahu homes were not always built for air conditioning. In 1970, only about 14% of Honolulu homes had AC. By 2019, about 70% did. Many older houses were designed to catch the trade winds, with no ductwork at all, which is why AC installation here often looks different from the mainland.

Whether you are adding AC for the first time or replacing a tired system, Universal Air Hawaii helps you choose the right equipment, sizes it properly, handles the paperwork and installs it cleanly. We serve homeowners across Oahu, from new Ewa and Kapolei subdivisions to older homes in Kaimuki, Kailua and Pearl City.

Choosing the right AC system for your Oahu home

There is no single best system. The right choice depends on your home's layout, whether you have ducts, how many rooms you want cooled, and your budget.

Split AC and ductless mini-splits

The most popular choice on Oahu. An outdoor condenser connects to one or more indoor heads through a small hole in the wall, so no ducts are needed. Each head can be controlled separately, which saves energy. Learn more on our split AC installation page.

Central AC

If your home already has ductwork, central air can cool the whole house through existing vents. Leaky or undersized ducts should be checked first, since they can waste a large share of what you pay to cool. See our central AC page for details.

Window and wall units

For a single bedroom, an ohana unit or a tight budget, a quality window or wall AC is still a smart option. Newer inverter window units run much more efficiently than older models.

Proper sizing: Manual J load calculation vs rules of thumb

Plenty of AC systems on Oahu are the wrong size. The old shortcut of one ton per so many square feet ignores everything that actually drives your cooling load: windows, roof type, insulation, sun exposure, ceiling height and how many people live there.

We use a Manual J load calculation, the industry standard method from ACCA, to size your system room by room. A home in sunny, dry Ewa Beach has a very different load than a shaded, humid home in Kaneohe, even at the same square footage.

  • Oversized AC cools the room fast, then shuts off before it removes humidity. You end up cold and clammy, and the system short cycles and wears out sooner.
  • Undersized AC runs nonstop on hot afternoons and never quite catches up.
  • Right-sized AC runs longer, steadier cycles that control both temperature and moisture, which matters a lot in Hawaii's humidity.

What we check during your in-home estimate

We measure rooms and windows, note which walls take afternoon sun, look at your roof and attic or ceiling space, and check your electrical panel for capacity. We also ask how you actually use the house: which rooms you sleep in, where you work from home, and whether you want to cool everything or just a few spaces. That conversation often matters as much as the math, because it decides whether one larger system or several smaller zones will serve you better. You leave with a clear written proposal, not a sales pitch.

Efficiency, SEER2 and your Hawaiian Electric bill

Oahu residential electricity averaged about 43 cents per kWh, roughly 2.3 times the U.S. average. At those rates, efficiency is not a nice-to-have. It is the biggest factor in what your AC costs you over its life.

SEER2 is the current efficiency rating for air conditioners, based on an updated test that better reflects real-world conditions. A higher SEER2 number means less electricity for the same cooling. Many systems now use inverter compressors, which speed up and slow down to match demand instead of slamming on and off. Inverters use less energy, run quieter and hold humidity down better.

We will show you the efficiency difference between options in plain terms, so you can weigh upfront cost against monthly savings.

Refrigerants: R-410A vs new A2L systems

The AC industry is in the middle of a refrigerant change. New systems use A2L refrigerants such as R-454B and R-32, which have a much lower global warming impact than R-410A. A2L refrigerants are classified as mildly flammable, so they are installed to updated codes and manufacturer requirements by trained technicians.

A 2026 EPA rule allows existing R-410A equipment made or imported before 2025 to keep being installed until stock runs out. That can be a way to save on a replacement, but R-410A service refrigerant is expected to get pricier as production phases down. We will walk you through the tradeoffs for your situation.

Rebates, cost planning and permits

Hawaii Energy rebates

Hawaii Energy offers instant rebates through participating contractors, including $400 to $550 per qualifying outdoor unit and $1,250 for a qualifying central AC retrofit. Rebates depend on size and efficiency, require a Hawaiian Electric bill, and are first-come, first-served while program funds last. We help you claim what you qualify for. See our Hawaii Energy rebates guide.

Planning the cost

A high-efficiency system can pay you back through lower bills. See paying for a new AC on Oahu for rebates and other ways to plan the cost.

Permits

Honolulu's building permit rules (ROH 18-3.1) exempt only limited work, such as same-material maintenance repairs up to $10,000 in a 12-month period that don't affect electrical or plumbing. New electrical circuits and panel work do require electrical permits, and new installations may require permits too. We confirm permit needs for each job before work starts and handle permits when required. Our Honolulu AC permit guide explains which jobs need one. If you live in a condo, your association will likely need to approve the work first.

What to expect on AC installation day

  • Arrival and walkthrough: We confirm equipment locations, protect floors and furniture, and answer last questions.
  • Removal: Old equipment is disconnected, refrigerant is recovered as EPA rules require, and the unit is hauled away.
  • Installation: We set the outdoor unit, mount indoor equipment, run line sets and drains, and complete electrical connections.
  • Testing: We evacuate and pressure-test the refrigerant lines, then check charge, airflow, drainage and controls.
  • Cleanup and training: We clean up, show you how to use your thermostat or remote, and explain filter care.
  • Rebate paperwork: We help you submit what is needed for any qualifying Hawaii Energy rebate.
Comfort Club membership

Salt air and humidity never take a day off. Neither do we.

Two precision tune-ups and cleanings a year, priority scheduling and member pricing, all for one low monthly price.

Join the Comfort Club
We built Universal Air to be the AC company we would want to call: find the real cause, explain the price before we touch anything, and leave your home cooler and cleaner than we found it. If something isn't right, call us directly at (808) 400-6593.
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FAQ

AC Installation FAQ

A single-zone split AC or like-for-like replacement is often done in one day. Multi-zone systems, new electrical circuits and central AC with duct work can take longer. Permits or condo association approval can add time before the install date.

It depends on more than square footage. Windows, sun exposure, insulation, roof type and your location on the island all matter. We run a Manual J load calculation to size the system correctly for your home.

If your home has no ducts, split AC is almost always the better fit and usually the most efficient. If you have good ductwork already, central AC can make sense. We compare both for your home.

New A2L systems using R-454B or R-32 are the long-term direction of the industry. Remaining R-410A equipment can still be installed and may cost less upfront, but its service refrigerant is expected to get pricier. We explain both so you can choose.

Many qualifying systems are eligible for instant rebates, $400 to $550 per qualifying outdoor unit or $1,250 for a qualifying central AC retrofit. Availability depends on program funds, and you need a Hawaiian Electric bill. We help you claim it.

It depends on the scope. New electrical circuits or panel work require electrical permits, and new installations may require permits. We check your project against Honolulu's permit rules and handle permits when required. Our Honolulu AC permit guide has the details.

Yes. Start with our instant estimate tool for a quick idea, then we can schedule an in-home visit for an exact quote.

Helpful AC guides

All AC guides

AC guide

What a Split AC Really Costs on Oahu in 2026, Line by Line

Read guide

Buying guide

What's the Best AC for Hawaii? Choosing a System for Your Oahu Home

Read guide

AC guide

Do You Need a Permit to Install AC in Honolulu?

Read guide

Related services

Split AC Installation

Split AC is the smartest way to cool an Oahu home that was built for the trade winds, with no ducts and no major construction. Universal Air Hawaii designs and installs ductless mini-splits that stay quiet, efficient and protected from salt air.

Learn more

Central AC

Ducted central AC keeps many Oahu homes cool, from newer Leeward subdivisions to larger family homes. We repair, replace and install central AC systems across Oahu, and help you claim Hawaii Energy rebates on qualifying upgrades.

Learn more

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