| The tstat I am talking about is inside your house mounted on the wall.Look at it this way...If you had 2 stats mounted on the wall,one was set at 72 to bring your HP on,the heat pump would start;thus suppling you heat.Let's say the other tstat is set for 68.When your room temp hit 68 your heat pump would keep running but the tsat set at 68 would bring on your extra heat;;;emer,backup,elect.When the room temp gets to 70 the elect heat shuts down,the heat pump keeps going until it satisfies the tstat you have set at 72. | 
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