It could be a faulty wire or connection. It could also be a faulty sensor or display unit.
By having the air conditioning set at 75, that means the air conditioner will come on only if the temperature in the house rises above 75. It will maintain the interior temperature at a temperature of not more than 75. If the outside air temperature is lower than 75 and you want the interior temperature to stay at 75, you will need to turn on the furnace and set it at 75. Now the furance will come on if the temperature in the house drops below 75 but will not come on if the temperature in the house rises above 75.
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