What ISEER means
and how to read it on a spec sheet.

How ISEER differs from EER

EER is a single-point ratio at one rating condition. ISEER weights performance across the temperature distribution of an Indian cooling season, so it rewards units that stay efficient at part load — which is where inverter compressors and modulating expansion devices earn their rating.

The BEE star bands

The star on the label is set by the rated ISEER falling into a BEE band. On the Ezentech sheet the split models are rated 4.35 (3-star) and 5.65 (5-star); the window models 3.35 (3-star) and 5.20 (5-star).

Why 5-star models use an electronic expansion valve

The expansion device meters refrigerant between condenser and evaporator. A capillary tube is a fixed restrictor; an electronic expansion valve (EEV) modulates flow with load. On the Ezentech sheet the 5-star split models carry an EEV and a two-row condenser coil in the largest outdoor cabinet, while the 3-star models use a capillary and a one-row coil. The indoor chassis is shared.

Reading it on the sheet

• Look for the rated ISEER next to the cooling capacity — both come from the same psychrometric test.
• Check the expansion type and condenser rows: they explain the star, not just the label.
• Ask whether the test was run in an NABL-accredited laboratory.