The Fan-Tastic Vent is not an air conditioner. It cools only if the outside air is cooler air than the inside. The thermostat simply tells it when to turn on. If it turns on between 75-80 it is doing its job. It should then keep running until the temperature falls below 75-80---which may not be until evening, when the outside air falls below 75-80.
Cross ventilation is also important. The moving air needs to go somewhere. If the bathroom door is closed while the fan is on, there's probably not enough circulation. Leaving the door ajar, or widening the gap under the door will improve this.
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