Revisions of the Notification of the Ministry of Economy, Trade and Industry (METI)  
under the Act on the Rational Use of energy  
 
Energy Efficiency Division 
Agency of Natural Resources and Energy  
Ministry of Economy, Trade and Industry  
 
1. Background  
Under the Act on the Rational Use of Energy (Law No. 49 of 1979; hereinafter referred to as 
the “ Energy Efficiency Law ”), the Minister of Economy, Trade and Industry shall es tablish and 
publicize standards  for manufacturers/importers  (hereinafter referred to as the 
“manufacturers, etc.”) , with regard to the improvement of the energy efficiency performance 
for the respective specified equipment  which is specified in the Cabinet Order under the 
Energy Efficiency Law  including Home -use air conditioners  .  
In addition, the energy efficiency standards shall be established taking into consideration 
the highest level of energy consumption performance of the respective spec ified equipment , 
future prospect s for technological development , and other related factors.  
The Minister propose s new energy efficiency standards for Home -use air conditioners  to 
promote rationalization of energy use pertaining to  Home -use air conditioners  in Japan in 
order to cope with the recent increase of ene rgy consumption in the household sector, 
climate change, and so forth. 
 
2. Outline of amendment  
(A) Scope  
Home -use air conditioners  
 
(B) Energy consumption efficiency and measurement method 
For the measur ement method for Annual Performance Factor  (hereinafter referred to as 
“APF”)  of Home -use air conditioners, t he current standard adopts  the method in use for  
"Room Air Conditioners" (JIS C 9612: 2005). Since this JIS was revised in 2013 and the 
measurement conditions were reviewed, the measurement method in the next standard will be 
the method specified in "Room air conditioners" (JIS C 9612: 2013). In addition, the measurement method of the next standar d will be calculated using the following formula.  
 
APF=Total  air conditioning  load during  the cooling  period＋Total  air conditioning  load during  the heating  period (Wh)
Power  consumption  during  the cooling  period＋Power  consumption  during  the heating  period (Wh)  
 
(C) Target fiscal year    The target fiscal year is as follows.  
(ⅰ) FY2027 and each subsequent fiscal year  (limited to Categories and  Target Standard 
Values (D ) Category Ⅰ to Ⅳ ) 
(ⅱ) FY2029 and each subsequent fiscal year  (limited to Categories and Target Standard 
Values (D) Category  Ⅴ to Ⅹ ) 
 
(D) Category and Targeted S tandard Value 
The categories and targeted standard value are as follows.  
 
Table. Category and Targeted Standard Value  of Home -use air conditioners  
Category 
name  Unit form  Cooling 
capacity  Specifications  Standard energy 
consumption efficiency 
calculation formula  
Ⅰ 
Non-ducted 
wall-hung type  
(excluding 
multi- type 
controlling 
operation of 
indoor units 
individually)  Up to 2.8kW  Other than 
cold region 
specifications  E=6.6 
Ⅱ Cold region 
specifications  E=6.2 
Ⅲ 
Over 2.8kW up 
to 28.0kW  Other than 
cold region 
specifications  E=6.84- 0.210×(A -2.8) 
(the upper limit must be 
6.6 
The lower limit must be 
5.3) 
Ⅳ Cold region 
specifications  E=6.44- 0.210×(A -2.8) 
(the upper limit must  be 
6.2 
The lower limit must  be 
4.9) 
Ⅴ Other non -
ducted type  
(excluding 
multi- type 
controlling 
operation of 
indoor units 
individually)  Up to 3.2kW  － E=5.4  
Ⅵ Over 3.2kW up 
to 4.0kW  － E=5.0 
Ⅶ Over 4.0kW up 
to 28.0kW  － E=4.5 
Ⅷ Multi- type 
controlling Up to 4.0kW  － E=5.6 
Ⅸ Over 4.0kW up － E=5.6 operation of 
indoor units 
individually  to 7.1kW  
Ⅹ Over 7.1kW up 
to 28.0kW  － E=5.5 
Remarks : E and A represent the following values, respectively.  
E: Standard energy consumption efficiency (unit: APF)  
A: Cooling capacity (unit: kilowatts)  
 
(E) Method of determin ing achievement  
The manufacturers of appliances are required to keep  a record of  the h armonic mean s of 
the energy consumption efficiency of appliances shipped in each fiscal year after the target 
fiscal year,  which is w eighted  with the number of units shipped for each category, at the same 
level or higher than the targeted standard value.  
 
4. Proposed date of entry into force  
Around May  of 2022*  
*Target fiscal year for achieving the new standard is set to be FY2027 or FY2029.