The city will be spending over $25,000 to replace the polypropylene glycol in the HVAC system at McMinnville Civic Center.The Board of Mayor and Aldermen has voted to accept a bid from Cookeville Heating & Cooling Services, LLC to provide labor and materials to perform the exchange.“It’s something that’s got to be done,” said Alderman Junior Medley.“If we’re going to keep the doors open,” said Alderman Jimmy Haley.The Safety Committee voted unanimously to hire Cookeville Heating to do the work, but Alderman Billy Wood wondered if the city could save money by just purchasing the material and installing it with city employees.“How hard is it to put this into the system?” Wood asked. “Is this a high-tech procedure?