A Guide to Air Conditioning Installation & Replacement in Japan

Wondering what heating options are available to help you get through Japanese winters and humid summers? 

Thinking of purchasing an air conditioning system for your home or apartment in Japan? 

Air conditioning installation and replacement in Japan works differently than in most countries, and understanding the system before you buy saves both time and money.

Most Japanese homes rely on individual air conditioning units, called eakon (エアコン), rather than the central air conditioning systems common in the US and Europe.

A single air conditioning unit typically costs between 45,000 yen and 130,000 yen depending on capacity, and standard air conditioner installation adds another 7,700 yen to 23,100 yen on top of that, based on current 2026 pricing from major electronics retailer BicCamera.

Units are sized by tatami mat capacity rather than square footage, need either a 100V or 200V outlet depending on power draw, and Japan's tightening 2027 energy efficiency standards are already pushing prices upward on budget models.

This guide walks through how to choose the right air conditioning unit, what a new air conditioner installation costs in different scenarios, what counts as standard versus non-standard air conditioning installation, and the Japanese vocabulary you will need along the way.

👉 Read also: An Easy Japanese Air Conditioner Guide: How-To Care & Clean

How Japanese AC units are different from central air conditioning systems

Before we go any further, let's clear the air on one thing: Japanese heating and cooling systems are different from the HVAC systems in the US and other places.

Unless you live in Hokkaido or specifically contract to install a central AC system, most Japanese homes and apartments will be heated and cooled through an air conditioning unit.

Japanese air conditioning units typically consist of two parts: an indoor unit, which is attached to an interior wall, and an outdoor unit, the condenser, which is either mounted to the exterior of your house or sits on the ground level.

If you are coming from the US, this setup is what American HVAC contractors call a mini split system: one outdoor unit connected by refrigerant piping to one or more indoor units, with no ductwork running through the house.

A whole house in Japan is usually cooled and heated by installing several of these individual air conditioning units, one per room, rather than a single central air conditioning system pushing air through shared ducts.

Central air is available, but it is far less common outside Hokkaido and new-build housing developments, and it typically requires a different, more involved installation process than a standard air conditioning unit.

How to choose the right air conditioning unit

If your apartment is small, you may only need to purchase 1 unit.

However, if you're trying to heat a whole house, you may want to place a unit in each room you'll use.

Here are some questions to consider when selecting your new air conditioner.

What size room am I trying to heat?

The first thing you’ll notice when shopping for a Japanese air conditioning unit is that AC manufacturers will market units based on Japanese room size, aka tatami size. 

First, determine the room size you're trying to heat, translate that into tatami mats, and then look for an air conditioner that can heat that area.

• 6 tatami mats (9.9174 sq. meters)

• 8 tatami mats (13.2232 sq. meters)

• 10 tatami mats (16.529 sq. meters)

• 12 tatami mats (19.8348 sq. meters)

• 14 tatami mats (23.1406 sq. meters)

• 18 tatami mats (29.7522 sq. meters)

• 20 tatami mats (33.058 sq. meters)

• 23 tatami mats (38.0167 sq. meters)

• 26 tatami mats (42.9754 sq. meters)

Room size calculator and recommended AC capacity chart

Room Size (sq. meters)	Tatami Mats	Recommended AC Capacity
9.9 m²	6 tatami	2.2kW
13.2 m²	8 tatami	2.5kW
16.5 m²	10 tatami	2.8kW
19.8 m²	12 tatami	3.6kW
23.1 m²	14 tatami	4.0kW
29.8 m²	18 tatami	5.6kW
33.1 m²	20 tatami	6.3kW

If you are used to shopping for air conditioners in the US, capacity is usually listed in BTUs per hour or tons rather than kW. As a rough guide, 1 kW is about 3,400 BTU/h, so a 2.2kW unit for a 6-tatami room is roughly 7,500 BTU/h, and a 6.3kW unit for a 20-tatami room is roughly 21,500 BTU/h.

Pro Tip: Choose a unit slightly larger than your room size for better efficiency and faster heating/cooling.

Decision tree: which AC is right for you?

Step 1: Room Usage

• Primary living space → Go larger (14+ tatami capacity)

• Bedroom only → Standard size (10-12 tatami)

• Secondary room → Smaller unit (6-8 tatami)

Step 2: Functions Needed

• Year-round use → Heat pump (heating + cooling)

• Summer only → Cooling-only model (cheaper)

• High humidity area → Look for advanced dehumidifying

Step 3: Power Requirements

• Small units (≤3.6kW) → 100V outlet OK

• Large units (≥4.0kW) → 200V outlet required

Step 4: Special Features

• Smart home integration → Wi-Fi enabled models

• Air quality concerns → Units with air purification

• Quiet operation → Inverter technology models

Do I need heating and cooling or just one or the other?

Many Japanese ACs can both heat and cool your house. 

However, some only have one function. 

So, if you're in the market for both functions, ensure the AC unit you're considering can provide both.

What voltage outlets are available in my house/apartment?

The standard electricity outlet in a Japanese house or apartment is 100 volts.

Some AC units are OK with a 100-volt outlet. However, the more powerful air conditioning units will require a 200-volt outlet. 

Before purchasing an AC unit, check its voltage requirements.

If you purchase a new air conditioner that requires 200 volts, you will need an electrician / or the AC installation team to help with rewiring.

How much do Japanese AC units cost?

Air conditioning unit prices vary by capacity, brand, and features, but as of mid-2026 a standard 6-tatami unit from a major Japanese manufacturer such as Hitachi, Daikin, Mitsubishi Electric, or Panasonic typically starts around 45,000 yen, while units sized for 12- to 14-tatami rooms generally run from 65,000 yen to 90,000 yen on retailers like Kakaku.com.

Prices for budget standard models have been climbing steadily because of Japan's 2027 AC problem (explained below), so exact figures shift month to month. Check Kakaku.com's current ranking pages for live pricing before you buy, and confirm whether financing options or installment plans are available if you are comparing a pricier, more energy efficient model against a cheaper standard one.

Keep in mind that air conditioners that heat small areas will be cheaper than those that heat larger areas.

AC units that provide heating and cooling systems will cost more than AC systems with only one heating or cooling feature.

To start price browsing for AC units, check out the following:

• AC units on Kakaku

• AC units on Rakuten

• AC units on Amazon Japan

See also: How To Set Up Utilities For The First Time in Japan And More

Why air conditioner prices are rising: Japan's 2027 AC problem

Starting in April 2027, Japan's Top Runner energy efficiency standards (トップランナー制度) for room air conditioners will tighten, and many affordable, lower-efficiency standard models will no longer be manufactured or sold once the new rules apply.

Japanese consumer electronics press has nicknamed this the "エアコン2027年問題," or Japan's 2027 AC problem, and Kakaku's own market reporting already shows budget models becoming harder to find at last year's prices.

If you are due for an air conditioning replacement anyway, buying before the standard changes can mean a lower sticker price today.

If you are not in a rush, waiting means every new air conditioning system on shelves after April 2027 will meet stricter efficiency requirements, which typically lowers energy bills over the long run even though the unit itself costs more upfront.

Total project cost breakdown for air conditioning installation and replacement

Here are some example scenarios of how much you can expect to pay to purchase a new air conditioner plus get it installed.

Scenario 1: 12-Tatami Living Room (Standard Installation)

• AC Unit: ¥65,000

• Standard Installation: ¥16,500

• Total: ¥81,500

Scenario 2: 14-Tatami Room, Second Floor (Non-Standard)

• AC Unit: ¥85,000

• Standard Installation: ¥20,900

• Extra piping (2m): ¥5,000

• Second floor surcharge: ¥15,000 Total: ¥125,900

Scenario 3: First AC Installation (New Construction)

• AC Unit: ¥70,000

• Standard Installation: ¥16,500

• Wall drilling: ¥8,000

• 200V outlet installation: ¥12,000 Total: ¥106,500

These scenarios use 2026 published installation rates from a major electronics retailer as a benchmark. Independent installers and other retailers price non-standard work differently, so treat these totals as planning estimates rather than firm quotes.

What to know about the air conditioning installation process

You have purchased or are about to purchase an AC unit, and now you are wondering how it will be installed.

Many sites will include the cost of installation within the price of the AC unit—but with many caveats.

A standard AC installation is straightforward, particularly if you're replacing an AC, as you don't need to cut a new hole for the AC pipes.

But if this is a new installation, or you want to install an aircon on the second floor of your house, or the room you want to install an aircon in doesn't have a wall connected to the outside of your house, then these will likely fall outside of the "free installation" requirements.

Most AC product pages will have an explanation of what will fall under a "free installation" so be sure to read the fine print.

Standard installation for air conditioning system

Some sites charge a "standard installation fee" and they'll list what type of installation they're willing to do for a certain price.

For example, BicCamera, a well-known Japanese electronics store, provides an AC installation service for "standard installation" at the following prices:

Air conditioner installation cost for standard installation	Installation fee
Air conditioners with a cooling capacity of 3.6kW or less (rooms of 6 to 12 tatami mats)	16,500 yen
Air conditioner with a cooling capacity of 4.0kW (rooms up to 14 tatami mats)	20,900 yen
Air conditioner with a cooling capacity of 5.0kW or more (large rooms of 18 tatami mats or more)	23,100 yen

Prices confirmed directly from BicCamera's official air conditioning installation price list as of mid-2026. Installation pricing changes periodically, so always confirm current rates before booking.

As far as what BicCamera considers "standard installation":

1. Installation of piping of 4m or less in length. *If the air conditioning indoor unit and the piping hole are separated, an insulated drain hose (starting from 1,980 yen per meter) will be used as an additional paid installation.

2. Connecting to an existing earth wire

3. Installation in walls with through-holes

4. Installation of piping and connecting wires up to 4m in length (tape-wrapped finish)

5. Vacuuming

6. Installation of the outdoor unit on flat ground or on a balcony (including plastic blocks)

A note on window air conditioners:

Window air conditioners are installed directly into a window frame, using the window opening itself instead of a wall-mounted indoor and outdoor unit pair. Portable air conditioning units go a step further: they sit freely on the floor and connect to a window with an exhaust hose, so they can be moved from room to room and need no permanent installation at all. Both options suit renters who cannot drill through an exterior wall, or anyone who only needs cooling in a room for part of the year.

Non-standard air conditioning installation

However, Biccamera's aircon installation service guide then goes on to describe the situations that would fall outside of the "standard installation":

• If the piping length needs to be 4m or more, or if the outdoor unit is to be installed on the roof or other work that does not fall under the standard installation work, an additional fee will be charged.

• When the material of the wall on which the air conditioner (indoor unit) is installed is special

• When the outdoor unit is installed other than on flat ground or on a balcony

• When the indoor unit and outdoor unit are on different floors/When the piping is 4m or longer

• In special cases where there is no hole for the piping

• When attaching a cover to a piping

• If there is no dedicated outlet for the air conditioner or if the power source, electrical capacity, or plug shape is different

• When installing an air conditioner with smartphone connectivity

• If your room is on the second floor or higher and there is no elevator

Even installations that otherwise qualify as standard can pick up smaller surcharges. BicCamera, for example, charges an extra 2,200 yen when the indoor unit has to be mounted on concrete, and an extra 1,650 yen when the wall material is not standard drywall or plaster.

Ask your installer to itemize every possible surcharge for your specific wall type and room layout before you commit to a purchase.

Here's an image that shows the different non-standard places an outdoor unit can be placed all but one of the installations will likely require additional fees from any installation provider.

Image source: Joshin

The AC installation in the above image that falls under "standard installation" would be the AC unit in the bottom left-hand corner. If you want to install a unit in any of the numbered locations in the image below, expect to pay more.

If you are purchasing an air conditioner replacement, some services will remove your old AC unit and recycle it for free, while others will charge you. So keep that in mind.

Pre-installation checklist

• Confirm room measurements and tatami size

• Check electrical outlet voltage (100V or 200V)

• Clear installation area of furniture

• Verify outdoor unit placement location

• Confirm installation appointment time

• Prepare payment method

• Take photos of current setup (if replacing)

Should you repair or replace your air conditioner?

If your air conditioning system is breaking down more often than it used to, that frequency is usually a stronger signal than age alone that it's time to replace rather than repair.

As a general rule, if your unit is under about 10 years old, a repair is often the more cost-effective choice, since major components typically still have useful life left. Once a unit is older than that and needs a costly repair, replacement usually pays off faster through lower running costs on a newer, more energy-efficient system.

the costs of installing a new air conditionerBecause every situation depends on the specific fault, the unit's age, and current repair pricing, it's worth getting an assessment from a professional installer before committing either way.

Questions to ask your installer

• Is my wall suitable for mounting?

• Where will the outdoor unit be placed?

• How long will installation take?

• What warranty is included?

• When should I schedule first maintenance?

• Will the outdoor unit's noise be noticeable in nearby bedrooms or a neighbor's window?

Most standard air conditioning installations are completed in about a day, from mounting the indoor and outdoor units to running the piping and testing the system. Before the installer leaves, they should run a final check to confirm the unit cools or heats properly, that the drain hose isn't leaking, and that the remote control is paired correctly. Ask to see this final test before signing off, especially if the installation involved any non-standard work.

Japanese vocabulary for HVAC systems

Here are some good-to-know Japanese terms to help you as you shop around for your new HVAC system:

General AC vocabulary

• エアコン (eakon) – Air conditioner (short for air conditioning)

• 冷房 (reibou) – Cooling (air conditioning mode)

• 暖房 (danbou) – Heating (air conditioning mode)

• 除湿 (joshitsu) – Dehumidifying (air conditioning mode)

• 加湿 (kashitsu) – Humidifying

• 空気清浄機能 (kuuki seijou kinou) – Air purification function

• リモコン (rimokon) – Remote control

• フィルター (firutā) – Filter

• 室外機 (shitsugaiki) – Outdoor unit (of the air conditioner)

• 室内機 (shitsunaiki) – Indoor unit (of the air conditioner)

AC installation vocabulary

• 取り付け (toritsuke) – Installation

• 工事 (kouji) – Construction or installation work

• 工事費用 (kouji hiyou) – Installation cost

• 配線 (haisen) – Wiring

• 配管 (haikan) – Piping

• 壁掛け式 (kabekake-shiki) – Wall-mounted type

• 設置場所 (secchi basho) – Installation location

• 下見 (shitami) – Pre-installation inspection

• 配電盤 (haidenban) – Electrical panel

• ドレンホース (doren hōsu) – Drain hose

AC troubleshooting and maintenance

• メンテナンス (mentenansu) – Maintenance

• 掃除 (souji) – Cleaning

• 水漏れ (mizumore) – Water leakage

• 異音 (ion) – Strange noise

• 故障 (koshou) – Malfunction or breakdown

• 修理 (shuuri) – Repair

• 点検 (tenken) – Inspection

AC-related Japanese phrases

• エアコンを設置したいです。 (Eakon o secchi shitai desu.) – I want to install an air conditioner.

• 工事の見積もりをお願いします。 (Kouji no mitsumori o onegaishimasu.) – Please provide an estimate for the installation work.

• このエアコンはどのくらいの部屋に適していますか？ (Kono eakon wa dono kurai no heya ni tekishiteimasu ka?) – What size room is this air conditioner suitable for?

• 工事にどれくらい時間がかかりますか？ (Kouji ni dorekurai jikan ga kakarimasu ka?) – How long will the installation take?

• 保証はありますか？ (Hoshou wa arimasu ka?) – Is there a warranty?

Frequently asked questions

What does standard AC installation include?

Standard AC installation in Japan covers the installation of a unit in a non-complex location on your house. For example, putting in an AC system on the first floor of your house where the pipe does not need to travel far to be connected to the outside AC unit would be considered standard by many AC installation teams. However, non-standard installation will often cover cases such as if you wish to place an AC unit on the second floor of your house, which will require a longer than usual pipe to reach the outside unit on the ground floor of your house or require that the outside unit be mounted to the wall of your house.

How much does it cost to install a new aircon in Japan?

Standard installation fees are often included in the price of the air conditioning unit. If you require non-standard installation for 1 AC unit, the cost can range from as low as 10,000 yen to as high as 50,000 to 70,000 yen.

What's the difference between 100V and 200V AC units?

100V units are suitable for smaller rooms (up to 12 tatami) and plug into standard outlets. 200V units are more powerful, suitable for larger spaces, but require special outlets and electrical work.

How long do Japanese AC units last?

Quality units from major brands typically last 10-15 years with proper maintenance. Budget models may last 8-10 years. Regular maintenance significantly extends lifespan.

Can I use my AC for heating in winter?

es, most Japanese AC units are heat pumps that provide both heating and cooling. They're very efficient for heating and are the primary heating method in most Japanese homes.

Why is my AC leaking water?

Water leaks usually indicate a clogged drain hose or improper installation angle. Check the drain hose first, and call a professional if the problem persists.

Could my air conditioner be the reason my electricity bill is high??

Yes, most likely. According to Japan's Ministry of Economy, Trade and Industry (METI), air conditioning accounts for roughly 34 to 38 percent of a typical household's daily electricity use during summer months, more than any other single appliance. High bills may indicate inefficient operation, poor insulation, or an aging unit running below its rated efficiency. If your air conditioning system is more than 10 years old, a newer, energy efficient model can often cut cooling costs noticeably over the long run, even after accounting for the upfront cost of an air conditioner replacement.

Can I use central air conditioning or a mini split system in my Japanese home?

Almost all Japanese homes and apartments use individual air conditioning units, the same setup Americans call a mini split, rather than central air conditioning. Each unit pairs one outdoor condenser with one or more indoor units connected by refrigerant piping, with no ductwork involved. Central air conditioning systems exist in Japan but are uncommon outside Hokkaido and some new-construction housing, and they typically require a more involved and expensive installation process than a standard air conditioning unit.

What is Japan's 2027 AC problem, and should it change when I buy?

Starting in April 2027, Japan's Top Runner energy efficiency standards for room air conditioners will tighten, and many affordable, lower-efficiency standard models will stop being manufactured once the new rules take effect. This shift, nicknamed the "2027 AC problem" in Japanese consumer media, is already nudging prices up on budget units. If you need an air conditioning replacement soon, buying before April 2027 can mean a lower price today, while waiting gets you a more energy efficient system with lower running costs afterward.

In closing

Now you know the basis for getting an air conditioning replacement or installing a new air conditioning system in Japan.

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