The Department of Administrative Services and each other budgeted agency, as defined in section 4-69, exercising procurement authority shall procure equipment and appliances for state use that meet or exceed the federal energy conservation standards set forth in the Energy Policy and Conservation Act, 42 USC 6295, any federal regulations adopted thereunder, any applicable energy performance standards and meet or exceed the federal Energy Star standards. Purchases of equipment and appliances for which energy performance standards have been established shall be (1) made from among those specific models of equipment and appliances which meet such standards, and (2) based, when possible, on competitive bids. Such bids shall be evaluated on the basis of the life-cycle cost standards, if any.