How to classify the seasonal energy efficiency ratio of air conditioning systems?
I. distinguish between several seasonal energy efficiency indicators (generally used for heating).
SEER: Seasonal Energy Efficiency Ratio for Cooling (Inverter Wall-Mounted/Floor-Mounted Units) , GB21455-2019, Level 1 is the highest , the higher the number, the more energy-efficient.
APF: Annual Energy Efficiency (for heat pump room air conditioners that cover both cooling and heating seasons) . Currently, the APF is the main indicator for the labeling of inverter air conditioners that support both cooling and heating.
IPLV (C): Integrated Part Load Factor for Cooling (VRF for Multi-Split Units, Chillers) , for commercial central air conditioning systems. It is not SEER, but belongs to the seasonal/part load energy efficiency index.
HSPF: Seasonal Energy Efficiency Ratio (Heat Pump Heating Season).
Note: For fixed-frequency room air conditioners, SEER is not assessed; rated EER is used instead . SEER is a seasonal indicator for variable-frequency models.
II. Split-type single-cooling air conditioner for the room, SEER rating (GB21455 2019, Level 5)
Rated cooling capacity (CC) | Level 1 SEER | Level 2 SEER | Level 3 SEER | Level 4 SEER | Level 5 SEER |
≤4500W (1.5 horsepower and below) | ≥5.80 | ≥5.40 | ≥5.00 | ≥3.90 | ≥3.70 |
4500＜CC≤7100W (2 horses) | ≥5.50 | ≥5.10 | ≥4.40 | ≥3.80 | ≥3.60 |
7100＜CC≤14000W (3 horses) | ≥5.20 | ≥4.70 | ≥4.00 | ≥3.70 | ≥3.50 |
Heat pump room air conditioners (cooling and heating type): do not use SEER classification, but APF classification , also level 5.
III. Multi-split air conditioner (VRF, GB21454 2021)
Air-cooled multi-split air conditioner:
Cooling-only type: Classified by SEER (Grade 1/2/3)
Heating and cooling heat pump type: using APF
Water-cooled multi-split air conditioners: classified by IPLV(C) (Level 1/2/3)
IV. Water chillers and air-cooled modular chillers (GB19577)
Using IPLV (Integrated Partial Load), it is divided into three levels: 1, 2, and 3 , and SEER is no longer used; level 1 is optimal.
V. A Simple Understanding of the Logic of Division
1. The smaller the energy efficiency rating, the higher the efficiency: Level 1 > Level 2 > Level 3 > Level 4 > Level 5;
2. SEER is the weighted average energy efficiency under different outdoor temperatures and loads throughout the entire cooling season, which is closer to real-world power consumption than the rated EER;
3. For residential wall-mounted and floor-standing air conditioners: For single-cooling inverters, consider SEER; for cooling and heating inverters, consider APF.
4. Commercial multi-split air conditioners and chillers: See IPLV (C) / IPLV (H).
VI. The difference between 14 SEER and 16 SEER
In short: 14 SEER and 16 SEER are the American standard for seasonal energy efficiency ratio (SEER) , which is mostly used in American ducted central air conditioning (split-type air-cooled cabinet units and rooftop units). They are not the Chinese national standard SEER (GB) , and cannot be directly compared with domestic air conditioner labels.
1. Definition
SEER = Total cooling capacity for the entire cooling season (BTU) ÷ Total electricity consumption for the season (Wh)
14 SEER : On average, it produces 14 BTU of cooling capacity for every 1Wh of electricity consumed.
16 SEER : On average, it produces 16 BTU of cooling capacity for every 1Wh of electricity consumed. The higher the number, the more energy-efficient it is in different seasons.
2. Comparison of 14 vs 16
For the same cooling capacity: Power consumption ratio = 14 ÷ 16 = 0.875 , 16SEER saves approximately 12.5% more energy than 14SEER.
14 SEER: American entry-level qualified models, mostly single-stage constant-volume compressors, and inexpensive.
16 SEER: Mainstream medium- and high-efficiency models, many of which are two-stage compressors/variable capacity models , with better temperature control and dehumidification , but at a higher cost.
3. Key pitfalls (make sure to distinguish them when selecting HVAC systems)
The US standard SEER is not the same as the domestic GB21455 SEER . The testing conditions are completely different, so they cannot be directly equated. The highest SEER for a 1.5 HP inverter in China is only 5.8, which is not the same system as the US standard SEER of more than 10.
SEER2 standard after 2023 , with more stringent testing:
14 SEER (old standard) ≈ 13.4 SEER2
16 SEER (old standard) ≈ 15.2 SEER2
SEER only considers the cooling season and does not include heating; for heat pump cooling and heating systems, the US standard is based on HSPF (heating season energy efficiency).
4. Simple Selection Reference
Short cooling time and cheap electricity: Choose 14 SEER for a short payback period; Hot regions with long annual cooling time and high electricity prices: Prioritize 16 SEER for longer-term electricity savings.
