How do I convert 110 volt anolog fan thermostat with 24 volt digital thermostat?

Don`t think it can be done, If I`m understanding question correctly

Thanks for your response! The reason I ask is that I have a 24 volt prgrammable thermostat and I can't return it!
Is there not some kind of switch box that you can put between the thermostat and the fan to convert it?