Just run a 18/3 or better(if you want to use a thermostat that isn't battery powered) wire to your current thermostat location, and use any thermostat that has A/C control also. Then just turn the fan switch to "on". Need to have RH/RC jumpered in the stat, and connect stat W to W in furnace and stat G to G in furnace. Along with C to C if you use a stat that is not battery powered.