I live in mobile home with a nordyne electric central heat and air. The 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 come 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.I can take the wall and cover off front of the furnace and look down around and see the coils red hot,also feel the heat and smell when near the furnace all that even when central ac is is running, ifyou could tell me anything about it would I thank you so much for the info.

Sounds like bad sequenser