top of page




ASHRAE/ACCA Standard 183: Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings

ASHRAE/ACCA Standard 183 is a joint standard developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and the Air Conditioning Contractors of America (ACCA) to establish minimum requirements for methods and procedures used to perform peak cooling and heating load calculations for buildings except low-rise residential buildings. The standard was first published in 2007 and revised in 2014. The purpose of the standard is to provide consistent and accurate methods for determining the design cooling and heating loads of buildings, which are essential for selecting, sizing, and designing HVAC systems. The standard applies to all types of buildings except single-family houses, multifamily structures of three stories or fewer above grade, manufactured houses (mobile homes), and manufactured houses (modular).

Download Zip:

The standard specifies the following requirements for load calculation methods and procedures:

  • The methods and procedures shall be based on sound engineering principles, relevant research data, and actual field measurements.

  • The methods and procedures shall account for all significant heat gain and heat loss factors that affect the cooling and heating loads of buildings.

  • The methods and procedures shall consider the effects of building orientation, solar radiation, internal heat gains, ventilation, infiltration, humidity, thermal mass, zoning, diversity, part-load performance, and other relevant factors.

  • The methods and procedures shall produce results that are consistent with the actual energy performance of buildings as verified by field measurements and tests.

  • The methods and procedures shall be documented in sufficient detail to allow replication of results by an independent party.

The standard also provides guidance on how to select appropriate design conditions, how to collect and analyze building data, how to use various calculation methods and tools, how to report and present load calculation results, and how to conduct quality assurance and quality control. The standard references several other ASHRAE standards and guidelines that provide more detailed information on specific aspects of load calculation, such as climatic data, ventilation requirements, thermal comfort criteria, energy modeling, etc.

The standard is intended to be used by HVAC designers, engineers, contractors, code officials, educators, researchers, and other professionals involved in the design and operation of HVAC systems for buildings. The standard is also intended to be adopted by code authorities as a minimum requirement for load calculation methods and procedures. The standard is available for purchase from ASHRAE or ACCA websites , or for preview from ANSI website.


  • ASHRAE/ACCA. 2014. ANSI/ASHRAE/ACCA Standard 183-2007 (RA 2014): Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings. Atlanta: ASHRAE.

ANSI. n.d. "Read-Only Versions of ASHRAE Standards." Accessed September 2, 2023. [

ASHRAE. n.d. "ASHRAE Bookstore." Accessed September 2, 2023. [

ACCA. n.d. "ACCA Store." Accessed September 2, 2023. [




bottom of page