I have an old clare hecla furnace with a digital thermostat the only wires are a red and whit. My furnace does not have a 24v power supply and the wire running from my stat to my furnace do not hook up to any other type of power. Does that mean that my thermostat is powering my furnace controls and if so how would I hook up central air (yellow and Brown) without a 24v power supply, will my stat provide the 24v power to my central air like it does to my furnace

You will need to buy and install a (Fan Center) available at HVA supply house. They are somewhat complicated to install and you need the assistance of a experanced tech.