I have a nordyne electric central heat and air model# is FEHBO-015HA,and with the ac running,the heat coils stays red all the time, and when the cool air gets to the desired temp that is set on and goes off ,you can still feel warm air out the vents. I cut different switches off someone told me to do, still don't do, which if it did I still would need heat when turns cold. Please help with suggestions thanks