OTAC Equipment Calculation Format
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I originally created this Excel workbook in 1986 to calculate chiller Overtime Airconditioning Cost (OTAC) for commercial office buildings. If you are a building operator and have to determine what your hourly HVAC Overtime rate is, then use this tool to simplify that effort. This tool has been challenged by many Tenants (Law firms) regarding the hourly rate and has never lost a Tenant Audit.