HVAC interactive effects (HVAC IE) are developed for internal load changing measures such as interior lighting and appliances and other plug loads measures. These effects can alter the "direct" electric and gas impacts for those measure due to resulting changes in heating and cooling HVAC system energy use. HVAC IE factors are available from the READI tool below but we have extracted those values for residential and non-residential lighting and make them available here in a workbook. (update posted 23 May 2012 - links on Summary tab fixed)