It's hard to say without you providing additional details (i.e. how you figured out it's 110V and not anything else).

But in general, thermostats are wired to receive power from the furnace or ac. If your furnace has 24V and you have extra wires in the wall - you can just buy a new thermostat and connect it to the new power wires. If you don't have extra wires, you may be able to use a kit that allows you to send multiple control signals over the same wire (you may need to add a c wire, or something else - depending on your current wiring). Worst case scenario - you can always buy a 24V adapter for the wall plug and power thermostat from it.