I have a lux programmable thermostat that was installed a while back. I have central air and never noticed before that the blower is constantly running even when the unit isnt. when it hits the right temperature and it kicks off but the blower stays on and never shuts off, can someone tell me what to do about this? Im not only worried about the cost of this constantly running, but what effect its working the unit. Any info on what i should be looking at to fix this would be appreciated.