暖房
だんぼう
danbou
= heating; room heating; heater
Danbou (暖房) means indoor heating — the system, device, or act of warming a room. In Japan, where traditional construction prioritized summer ventilation over winter insulation, effective danbou is an essential part of cold-season domestic life.
Danbou (暖房) refers to indoor heating in all its forms: the system, the act of heating, or the device that heats. Danbou wo tsukeru (暖房をつける, to turn on the heating), danbou wo kesu (暖房を消す, to turn off the heating), and danbou ga kiku (暖房が効く, the heating is working/effective) are the standard phrases. The opposite word is reibou (冷房, air conditioning/cooling). Japanese heating devices include: ea kon (エアコン, air conditioner with heat pump — most common modern heating and cooling unit), kotatsu (こたつ, heated low table with a blanket skirt), kerosene faan heetaa (灯油ファンヒーター, kerosene fan heater), and yuka danbou (床暖房, underfloor heating — increasingly popular in modern apartments). Danbou-hi (暖房費, heating costs) is a key household expense in winter.
The Japanese air conditioner (ea kon, エアコン) operates as both heater and cooler, with heating mode activated by pressing the danbou (暖房) button and cooling mode activated by reibou (冷房). On a remote control, the sun icon or 暖 symbol indicates heating mode. Japanese apartments built since the 1990s almost universally include an installed ea kon unit that covers both functions. Older and traditional buildings may require supplementary kerosene heaters — and the ritual of filling the kerosene tank (touyu wo ireru) is a distinctly Japanese winter experience.
暖房 uses 暖 (dan/atatakai — warm, warmth) and 房 (bou — room, chamber, section). Together: ‘warming the room’ — a compound that names both the action and the result. The character 暖 appears in ondanka (温暖化, global warming) and danki (暖気, warm air/warm weather). Its opposite reibou (冷房) uses 冷 (rei — cold) + 房 (room): ‘cooling the room.’
Everyday use
帰ったらすぐに暖房をつけて部屋を温めた。
Kaettara sugu ni danbou wo tsukete heya wo atatameta.
When I got home, I immediately turned on the heating to warm up the room.
Casual / Social Media
暖房代が怖すぎて電気代の請求書見るのが憂鬱。
Danbou-dai ga kowasugite denkidai no seikyuusho miru no ga yuuutsu.
I’m scared to look at the electricity bill because of how much the heating costs.
Formal / Cultural context
伝統的な日本家屋は夏の通気性を重視しており、冬の暖房効率が低い傾向がある。
Dentouteki na nihon kaya wa natsu no tsuukisei wo juushi shite ori, fuyu no danbou kouritsu ga hikui keikou ga aru.
Traditional Japanese houses prioritize summer ventilation and tend to be less efficient for winter heating.
Japan’s traditional architecture was designed for humid summers, not cold winters — open wooden construction, paper screens (shoji), and minimal insulation mean that many older Japanese homes become frigid in winter. This architectural reality made portable heating essential: the kotatsu (こたつ) — a low table with an electric heating element underneath and a thick blanket skirt that traps warmth — became the central winter furniture item for families, allowing everyone to keep warm while sitting around the table together. The kotatsu is more energy-efficient than heating an entire room and has strong cultural associations with winter family togetherness.
Modern Japanese apartments have largely solved the insulation problem, and ea kon danbou is now standard. But danbou-hi (暖房費, heating costs) remains a significant household concern — especially for older residents on fixed incomes living in poorly insulated housing. Japan’s 2011 Fukushima disaster and subsequent nuclear power shutdowns significantly increased electricity and heating fuel costs, embedding danbou economics into national consciousness. The government’s recommendation to set ea kon heating to 20°C in winter — rather than the warmer settings many prefer — is a recurring energy conservation message each autumn.
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