Rooftop Air Conditioning Unit Evaluation Methodology

This toolkit contains resources to guide building owners and facility managers through a step-by-step method of evaluating and managing their inventory of RTUs and how to make the business case for replacements, retrofits, and quality maintenance practices.

    This decision tree guides the reader through the challenging task of determining how to manage existing rooftop units with easy to follow evaluation questions and links to additional resources for more information.
    Use the RTU Inventory Spreadsheet to gather basic information (i.e., number, size, age, general condition, etc.) 
    This spreadsheet lists financial incentives and financing programs in areas for the highest energy savings opportunities.
    The Rooftop Unit Comparison Calculator (RTUCC) compares high-efficiency rooftop air conditioners to standard equipment in terms of life cycle cost. 
    This document introduces the key elements to consider in making the business case for a proactive high-efficiency RTU replacement strategy for facility maintenance staff and building engineers responsible for energy management.
    Common sizing mistakes (with respect to cooling tonnage and supply fan horsepower) can be controlled with these recommended processes to help project teams avoid those mistakes and ensure effective RTU replacement investments.
    The purpose of this document is to provide a menu of lease clauses to facilitate rooftop unit (RTU) efficiency in retail leases for both retail tenants and commercial real estate landlords.
    The Offeror shall provide a detailed description of the rooftop unit (RTU) model offered for sale in response to this Solicitation.
    This specification provides a description of rooftop unit (RTU) efficiency and functionality characteristics that align with the goals of DOE’s Advanced RTU Campaign for new or replacement installations.
    This specification lists potential important features and best applications for advanced rooftop unit controllers.
    Adidas developed an RTU procurement specifcation to standardize equipment and to obtain competitive pricing through National Accounts for future planned replacements.
    The Advanced RTU Campaign is a recognition and guidance program designed to encourage building owners and operators to take advantage of savings opportunities from high-efficiency RTUs.
    Various M&V methods are helpful in estimating the payback and justifying future projects and understanding water efficiencies, emissions reductions, maintenance costs and savings, indoor environmental quality (IEQ) improvements, and occupant satisfaction.
    Adidas implemented a successful planned RTU replacement program to save energy and avoid costly emergency replacements.
    Learn how Arby's Restaurant Group's innovative approach to RTU management garnered them $287,000 and 2.9 million kWh in annual savings.
    Fontana Unified School District in southern California used grant money to install 201 high-efficiency Carrier RTUs in 30 buildings across four schools, resulting in $214,000 saved per year. 
    The creative and determined leadership of Efficiency Vermont successfully completed a 66-rooftop unit (RTU) high-efficiency replacement project on a large 140,000 square foot office building in Vermont.
    In order to streamline efforts for eliminating inefficiencies, JC Penney pursued a pilot program for RTU variable frequency drive (VFD) technology. Following the successful pilot program, JC Penney retrofitted 1,330 rooftop units in 130 additional stores with the VFD retrofit solution. The company recognized savings of as much as 47,800,000 kWh, a 22% reduction from before the VFD retrofit and a monetary savings of as much as $5 million.
    A study was commissioned to compare the Rebel unit with a standard reference unit in the field to estimate the seasonal performance of the RTU Challenge unit and the annual savings that can be achieved.
    As part of the U.S. Navy’s overall energy strategy, the National Renewable Energy Laboratory (NREL) partnered with the Naval Facilities Engineering Command (NAVFAC) to demonstrate marketready energy efficiency measures, renewable energy generation, and energy systems integration.
    Through it's partnership with the Better Buildings Alliance's Advanced Rooftop Unit Campaign (ARC), Target has developed a highly successful rooftop unit replacement program that will produce estimated cost savings of 1.3 million annually.
    Walgreens has developed a successful program to strategically retire RTUs prior to failure and replace them with high-efficiency units. In just 150 stores, Walgreens realized more than $1 million in savings from material and labor budgets.

Tool type:



HVAC, Rooftop Unit