IS 1391 is the specification for room air conditioners — the most common cooling equipment in Indian buildings. Covers window and split types, both fixed-speed and inverter. ISI mark and BEE star rating are mandatory for ACs sold in India. ISEER (Indian Seasonal Energy Efficiency Ratio) determines the star rating.
Specification for room air conditioners (window and split type) covering performance, energy efficiency, noise, safety, and testing requirements.
Key Values
Common capacity1.0, 1.5, 2.0 tonnes
5-star ISEER (2024)>4.65 for split inverter
Noise indoor unitMax 40-46 dB(A)
Practical Notes
! BEE star rating is mandatory — 5-star AC saves 20-30% electricity vs 3-star.
! Inverter ACs are 30-50% more efficient than fixed-speed at partial loads — always specify inverter for new installations.