Clarifying IEER vs. SEER vs. EER terminology | EnVisioneering Exchange Podcast

In this clip from Episode 31 of the EnVisioneering Exchange Podcast, Victor Marinich, global marketing director for A/C at Danfoss, breaks down IEER (integrated energy efficiency ratio), SEER (seasonal energy efficiency ratio) and EER (energy efficiency ratio) terminology.

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EnVisioneering Exchange is a podcast hosted by John Sheff, former Danfoss Director of Public and Industry Affairs, in which he discusses the most important topics in buildings and urban efficiency in conversation with our industry's foremost thought leaders.

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[Papasquatch]

The conversions used in HVAC efficiency metrics, such as those between SEER and SEER2, or EER and EER2, are indeed close estimates rather than exact conversions. These conversions are intended to provide a way to relate older metrics to newer standards after adjustments have been made to reflect changes in testing procedures or regulatory standards. The conversions are practical tools for comparison but should be understood as approximations rather than precise mathematical equivalents.
System Type Application:
• Category 1 (5-ton ≤ SEER/SEER2):
Typically, SEER and SEER2 are the relevant metrics. If the system is a heat pump, then HSPF/HSPF2 would also apply.
• Category 2 (5-ton > EER/EER2, IEER):
For larger systems, EER, EER2, and IEER are more relevant. If these systems are heat pumps, then HSPF/HSPF2 and COP/COP2 would also be considered.
Equations:
1. Cooling
a. SEER & SEER2:
• Seasonal Energy Efficiency Ratio (SEER)
• Seasonal Energy Efficiency Ratio 2 (SEER2)
• Conversion:
1. SEER = SEER2 × 1.045
2. SEER2 = SEER / 1.045
3. SEER = EER / 0.813
b. EER & EER2:
• Energy Efficiency Ratio (EER)
• Energy Efficiency Ratio 2 (EER2)
• Conversion:
1. EER = EER2 1.04
2. EER2 = EER / 1.04
3. EER = SEER × 0.813
c. IEER:
• Integrated Energy Efficiency Ratio (IEER)
o Example EER is 11:
EER at 100% load = 11.0
EER at 75% load = 13.9
EER at 50% load = 18.4
EER at 25% load = 19.1


 IEER= 15.563
 IEER=~15.6
2. Heating
a. HSPF & HSPF2 (Heat Pumps Only):
• Heating Seasonal Performance Factor (HSPF)
• Heating Seasonal Performance Factor 2 (HSPF2)
• Conversion:
1. HSPF = HSPF2 × 1.18
2. HSPF2 = HSPF / 1.18
b. COP:
• Coefficient of Performance (for Heat Pumps and sometimes Chillers)
• Conversion:
1. COP = HSPF × 0.293
2. HSPF = COP / 0.293

[VanAntony-lk]

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