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

A Japanese air conditioner (エアコン, ēakon) is an essential appliance in most Japanese homes, handling both cooling in humid summers and heating through cold winters.

Unlike many Western countries where central heating and cooling is standard, Japan relies primarily on wall-mounted split-type AC units — one indoor unit and one outdoor compressor — that work year-round.

According to Japan's Ministry of Economy, Trade and Industry (METI), air conditioning and heating together account for approximately 30% of household electricity consumption in Japan, making your AC unit the single largest driver of your electricity bill.

Proper maintenance, including filter cleaning every two to four weeks during peak season, can reduce electricity costs by 15–25% and extend your unit's lifespan from the standard 10 years to 12 years or more.

Here's what to know about how to care for and clean your Japanese air conditioner so that it will keep working properly throughout humid summers and freezing winters.

Does Japan have air conditioning?

Wall-mounted air conditioners are common in Japan

Yes, Japan does have air conditioning.

While central heating and air conditioning are common in some Japanese buildings, wall-unit air conditioners are more common.

Japanese air conditioner installation

When searching for an apartment, an akiya house, or any other property in Japan, you may find that it doesn't come with a pre-installed Japanese air conditioner.

In such cases, you'll need to purchase and install your own unit(s). Air conditioners can be bought at department stores, many of which offer discounts and point incentives if you purchase two or more units with installation included.

Be sure to consider the size of the room where each unit will be installed. Generally, the larger the AC unit, the more effective it will be at cooling or heating a larger space.

If you just bought a property in Japan and need help setting up your utilities, wifi, and AC installation, let MailMate bilingual property management services handle the work for you. 

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Japanese air conditioner remote control guide

If you don't read Japanese, the air conditioner remote might appear daunting at first glance. Below is a picture-based guide, explaining each of the buttons on your AC remote.

Translated エアコン remote buttons. Image from Japan Mobility

Once you know what each button means, using the Japanese air conditioner remote is just like using any other remote controller for the AC unit. 

Here is a translated guide:

Choosing the right Japanese AC unit size

Japanese air conditioners are sized by the room area they can effectively heat or cool, measured in tatami mats (畳, jo). When shopping, you will see two figures on the packaging: one for cooling (冷房) and one for heating (暖房), because heating requires more power. Always use the heating figure as your reference.

Tip: choose a unit rated one step larger than your room size for faster cooling, quieter operation, and better efficiency at moderate temperatures.

Money-saving remote settings

Interested in keeping your electricity bill down without sacrificing comfort?

Here are some tips to keep in mind:

Summer optimization (June-September):

• Temperature: 26-28°C (each degree lower increases costs 10%)

• Mode: AUTO or ECO

• Fan: AUTO speed

Winter optimization (December-March):

• Temperature: 18-20°C (each degree higher increases costs 10%)

• Mode: AUTO

• Use 内部クリーン after each session

How to clean your air conditioner in Japan

If you've been using your air conditioner in Japan for a while now, it might be time for a cleaning.

While you can call a professional, cleaning the AC yourself is relatively easy.

Step 1: Buy an AC cleaner spray

Search for エアコン洗浄スプレー online or at drugstores in Japan. For unscented smells, look for this kanji: 無香性.

Step 2: Unplug your AC

For safety reasons, turn off and unplug your AC from its socket. 

Step 3: Open your AC unit 

Most AC units can be easily accessed without tools. Pull the tabs at the end up, and the whole cover will open.

Step 4 Remove and clean the filter

Depending on the size of your AC, you will have one or two dust filters. Remove those by pulling up and slightly toggling them so they come loose. 

Once removed, clean the filters. You can do so by washing and drying them in your bath unit. 

Step 5: Apply the cleaner

Follow the instructions on the AC unit cleaner.

Generally, you hold the spray about 5 cm away from the air conditioner and spray liberally. 

Wait 10 minutes, and then you are good to go.

Step 6: Reassemble the AC

Place your air filters back inside your AC unit, plug it back in, and congratulations! You've cleaned your Japanese AC unit.

While a yearly cleaning is sufficient for general maintenance, it's a good idea to clean your AC filters before both the summer heat and the winter cold to ensure the unit operates efficiently.

Note: a yearly deep clean is sufficient for the internal components, but the dust filters (フィルター) should be cleaned every two to four weeks during peak season — June through September in summer, and December through February in winter. Dust buildup on filters is the single fastest way to reduce cooling efficiency and raise your electricity bill. Most Japanese AC units have a filter alert light (フィルターサインランプ) that illuminates when cleaning is due.

Your AC's money-saving maintenance schedule

Reduce your electricity bill by cleaning your AC before each season begins. Here are some example estimated savings you can expect:

Spring preparation (March-April)

Time Investment: 30 minutes Potential Savings: ¥15,000 over summer

• Deep clean filters and internal components

• Test all remote functions

• Check for winter damage or leaks

• Schedule professional inspection if unit is 5+ years old

Pre-summer deep clean (May)

Time Investment: 45 minutes Potential Savings: ¥20,000 over summer

• Complete cleaning procedure (detailed below)

• Test cooling efficiency

• Check drainage system

• Stock up on cleaning supplies

Monthly during peak season (June-September, December-February)

Time Investment: 10 minutes Prevents: 30% efficiency loss

• Quick filter rinse and dry

• Wipe exterior vents

• Check for unusual sounds or smells

• Run self-clean cycle

Fall maintenance (October-November)

Time Investment: 20 minutes Extends Lifespan: 2-3 years

• Final deep clean before winter

• Test heating function

• Clean remote control

• Document any needed repairs

Frequently asked questions

What is an エアコン (ēakon) in Japan?

エアコン (ēakon, or aircon) is the Japanese word for air conditioner. The word derives from the English term "air conditioner" and is composed of its first two syllables: "air" and "con(ditioner)." In Japan, almost all residential air conditioners are wall-mounted split-type units (スプリットエアコン), consisting of an indoor unit mounted near the ceiling on the interior wall and an outdoor compressor unit on the exterior. Unlike the central heating and air conditioning systems common in the United States, each room in a Japanese house or apartment typically has its own independent AC unit, which you control separately with a remote controller. According to METI, heating and cooling together account for approximately 30% of household electricity consumption in Japan, making the エアコン the most important appliance to use and maintain efficiently.

Which Japanese AC brand offers the best value?

The major Japanese air conditioner brands are Daikin, Mitsubishi Electric, Panasonic, Hitachi, and Fujitsu. Daikin leads in overall energy efficiency and long-term reliability and is the brand most closely associated with domestic Japanese manufacturing. Mitsubishi Electric excels in heating performance, making it a popular choice for cold regions like Hokkaido and Tohoku. Panasonic and Fujitsu offer strong mid-range options with good self-cleaning functions. For most users in a standard Japanese apartment or house, a mid-range Daikin or Mitsubishi Electric unit offers the best 10-year cost of ownership. These brands are widely available at Yodobashi Camera, Bic Camera, and Yamada Denki, where bundle pricing (two or more units with installation) is common.

How often should I clean my Japanese AC filter?

During peak season — summer (June through September) and winter (December through February) — dust filters should be cleaned every two to four weeks. Dust and pollen accumulate quickly in Japan's high-humidity climate, and a clogged filter forces the unit to work harder, raising electricity consumption and reducing cool air output. Most Japanese AC units have a filter alert light (フィルターサインランプ) that will illuminate when cleaning is due. A full internal cleaning using エアコン洗浄スプレー (AC cleaning spray) is recommended once a year — typically in May before summer begins, or in late October before winter heating season.

How much does Japanese AC electricity cost per month?

In Tokyo in 2025, the average electricity tariff is approximately ¥30–¥40 per kWh. A small 2.2 kW bedroom unit running eight hours daily in summer adds approximately ¥2,500–¥4,000 per month to your electricity bill. A larger 5.6 kW living room unit adds approximately ¥5,000–¥8,000 per month with daily use. For a two-bedroom apartment with two units running regularly, total summer AC costs typically fall in the range of ¥8,000–¥15,000 per month. Winter heating costs are slightly lower because heat pump heating is more energy-efficient than cooling. Adjusting your set temperature by just 1°C — up in summer or down in winter — reduces AC electricity consumption by approximately 10%.

What is the recommended temperature setting for a Japanese air conditioner?

In summer, the Japanese Ministry of the Environment recommends setting your AC to 28°C (82°F) as the standard energy-saving target. In practice, 26–28°C with the fan on AUTO and ECO mode enabled is comfortable for most people. In winter, 20°C (68°F) is the recommended heating target. Each degree you lower the cooling temperature or raise the heating temperature adds approximately 10% to your AC electricity costs. During Japan's rainy season (梅雨, tsuyu) in June and July, switching to 除湿 (joshitsu, dehumidifier) mode removes moisture from the air without over-cooling the room, which is often more comfortable and uses less electricity than full cooling mode.

Can I install a Japanese air conditioner myself?

No. Japanese law requires licensed technicians (冷媒取扱技術者) for any work involving refrigerant — the chemical coolant inside your AC unit. DIY installation voids the unit's warranty and violates Japan's building codes under the High-Pressure Gas Safety Act. Basic professional installation by an electronics chain costs approximately ¥14,300–¥19,800. Additional costs can include removal of an old unit (¥5,000–¥10,000), extra piping (¥3,000–¥5,000 per meter), and high-floor or non-standard installation surcharges. Always read the fine print on "free installation" offers, as these typically cover standard ground-floor replacement only.

How long does a Japanese air conditioner last?

A well-maintained Japanese air conditioner typically lasts 10–12 years. With annual deep cleaning, regular filter maintenance, and proper seasonal use, some units run reliably for up to 15 years. Signs that your unit is due for replacement include: repair costs exceeding 50% of the price of a new unit, noticeably higher electricity bills despite regular maintenance, refrigerant leaks that require repeated recharging, and reduced heating or cooling output that filter cleaning does not resolve. Japan's METI introduced updated energy efficiency standards (APF) for wall-mounted AC units targeting FY2027, so new units purchased from 2025 onward will be significantly more efficient than units from 10+ years ago.

What is the self-cleaning mode (内部クリーン) on a Japanese AC?

The 内部クリーン (naibu kurīn, internal clean) function — also labeled 送風/内部クリーン (soufu/naibu kurīn) on some remotes — activates after the AC shuts off and runs the fan for 30–90 minutes to dry out the interior of the indoor unit. This prevents mold (カビ, kabi) from growing inside the unit, which is a significant problem in Japan's high-humidity climate. It is especially important to run the self-cleaning mode after cooling sessions in summer, when moisture from the air condenses inside the unit. Mold growing inside an AC unit produces an unpleasant smell and can spread spores into the room air. Set the 内部クリーン function to run automatically if your model supports it — this is one of the most important settings for long-term unit health and air quality in a Japanese home.

In closing 

A well-maintained AC doesn't just save money—it ensures you stay comfortable during Japan's challenging summers and winters, making your life in Japan significantly more enjoyable.