how to set inside air temperature as an output variable in warehouse model

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You didn't tag which software you're using, but I'll assume it's rooted in EnergyPlus. You need to add the following Output:Variable object.

Output:Variable,
  ,                         !-Key Value
 Zone Mean Air Temperature, !- Variable Name
 Hourly;                    !- Reporting Frequency

Look at the *.rdd file in the E+ output directory of your *.idf for more variable names.