Ministry of Internal Affairs and Communications monitors the price of a room air conditioner monthly.
The data below show the changes in the price indexes of room air conditioner between 1985 and 2014, if the price in 2010 is taken as 100.
In terms of vacuum room air conditioners, the ministry adjusts the price index by "Hedonic price index" when they calculates the index. The following graph shows how much money you need, in order to get the same performance (same quality) room air conditioner between 1985 and 2014.
| Year | Index (2010 = 100) | Price of a room air conditioner (yen) |
| 1985 | 528.1 | 1,056,564 |
| 1986 | 510.1 | 1,020,552 |
| 1987 | 494.3 | 988,941 |
| 1988 | 476.3 | 952,929 |
| 1989 | 454.1 | 908,513 |
| 1990 | 407.7 | 815,681 |
| 1991 | 360.8 | 721,849 |
| 1992 | 358.8 | 717,848 |
| 1993 | 352.6 | 705,443 |
| 1994 | 323.7 | 647,623 |
| 1995 | 309.8 | 619,814 |
| 1996 | 295.9 | 592,004 |
| 1997 | 287.5 | 575,198 |
| 1998 | 272.7 | 545,588 |
| 1999 | 278.5 | 557,192 |
| 2000 | 241.7 | 483,567 |
| 2001 | 219.2 | 438,551 |
| 2002 | 200.8 | 401,739 |
| 2003 | 187.1 | 374,329 |
| 2004 | 166.8 | 333,715 |
| 2005 | 151.3 | 302,704 |
| 2006 | 143.0 | 286,099 |
| 2007 | 125.4 | 250,887 |
| 2008 | 122.5 | 245,085 |
| 2009 | 118.8 | 237,682 |
| 2010 | 100.0 | 200,069 |
| 2011 | 88.4 | 176,861 |
| 2012 | 88.9 | 177,861 |
| 2013 | 82.3 | 164,657 |
| 2014 | 93.6 | 187,265 |
The next graph shows the changes in the room air conditioner price from 1985 to 2014.
Source is Statistics Bureau. 消費者物価指数 (CPI) 結果
www.stat.go.jp/data/cpi/historic.htm
www.e-stat.go.jp/SG1/estat/Csvdl.do?sinfid=000011288564
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