I had a brand new Amana split gas unit installed about a year ago. Outside temperatures here are currently reaching 75 to 80 during the day, and dropping to lower 40s at night. I have been leaving my ac on during the day, but at night the gas heat unit is automatically turning on and runnning constantly, even though the thermostat is still set to cool and 70 degrees. I woke up at 2 this morning to find my house at a blistering 87 degrees! Any suggestions?