Select Page

Operable Window/Door Switch Edit

2016 Title 24 CASE Topics

Measure Overview

The intent of the Operable Window/Door Switch measure is to prevent unnecessary use of energy for heating or cooling of additional un-tempered air if an operable window or door is left open outside of times when it is beneficial to leave it open. This is accomplished with a simple mechanical interlock that disables heating or cooling when any window or door in the room with the thermostat is left open. It is important to note that mechanical ventilation would not be required to be disabled. For example, this requirement could be met by resetting the active heating setpoint to 50 degrees Fahrenheit (oF) and the active cooling setpoint to 100oF while still providing minimum ventilation to a zone with open windows or doors.

Section 2.2 of the CASE Report provides detailed information about the proposed changes to the standards, appendices, alternative compliance manual and other documents that will be modified by the proposed code change. See the following tables for an inventory of sections of each document that will be modified:

  • Table 7: Scope of Code Change Proposal (page 12)
  • Table 8: Sections of Standards Impacted by Proposed Code Change (page 12)
  • Table 9: Appendices Impacted by Proposed Code Change (page 12)
  • Table 10: Sections of ACM Impacted by Proposed Code Change (page 13)

Stakeholder Meeting

Several stakeholder meetings and CEC staff workshops were held regarding the Nonresidential HVAC Economizer Modifications building energy efficiency topic. The list of past meetings and hearings can be found here. If you would like to receive email updates on this CASE topic, click the link below.


  1. Final CASE Report