Similar International Standards
ASHRAE 90.1-2022American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), USA
HighCurrent
Energy Standard for Buildings Except Low-Rise Residential Buildings
Both standards provide minimum energy efficiency requirements for commercial building HVAC systems, including equipment, controls, and system design.
EN 16798-3:2017European Committee for Standardization (CEN), Europe
HighCurrent
Energy performance of buildings - Ventilation for buildings - Part 3: For non-residential buildings - Performance requirements for ventilation and room-conditioning systems (Modules M5-1, M5-4)
Focuses specifically on performance requirements for ventilation and air-conditioning systems in non-residential buildings, aligning with the HVAC scope of IS 9008.
ISO 52000-1:2017International Organization for Standardization (ISO), International
MediumCurrent
Energy performance of buildings — Overarching EPB assessment — Part 1: General framework and procedures
Provides a high-level framework for assessing building energy performance, under which specific HVAC requirements similar to IS 9008 would fall.
ASHRAE 189.1-2023American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), USA
MediumCurrent
Standard for the Design of High-Performance Green Buildings
Covers HVAC energy efficiency but as part of a broader, more stringent 'green building' standard, setting requirements that often exceed minimum code.
Key Differences
≠IS 9008:2019 is primarily prescriptive, while ASHRAE 90.1 offers well-defined alternative performance paths like the Energy Cost Budget (ECB) method, allowing more design flexibility.
≠Climate zone definitions differ significantly. IS 9008 uses the 5 Indian climatic zones (Hot-Dry, Warm-Humid, Composite, etc.), whereas ASHRAE 90.1 uses a more granular system of 8 primary zones based on heating and cooling degree days.
≠Equipment efficiency requirements in IS 9008 are referenced to Indian standards (IS) and the Bureau of Energy Efficiency (BEE) star labeling program, while international standards reference their regional schemes (e.g., AHRI in the US, Eurovent in Europe).
≠Air-side economizer requirements in IS 9008 are based on broader climate zones and system capacities, while ASHRAE 90.1 provides very specific, climate-zone-dependent trade-off tables and thresholds for when economizers are mandatory.
Key Similarities
≈Both standards contain a set of mandatory provisions covering fundamental aspects like equipment efficiency, system controls, and insulation that must be met regardless of the compliance approach.
≈A core principle in both IS 9008 and its international counterparts is setting minimum efficiency levels for HVAC equipment such as chillers, boilers, pumps, and fans.
≈Both mandate minimum levels of thermal insulation for HVAC ductwork and piping to reduce energy losses, with required thickness typically varying by pipe/duct size and fluid/air temperature.
≈Both standards require system controls such as thermostats for individual zones, automatic shutdown capabilities, and, in certain high-density applications, Demand Controlled Ventilation (DCV).
≈Both emphasize the need for proper system installation and performance, requiring air and hydronic systems to be balanced to ensure they operate according to the design intent.