First, humidity is not measured in "degrees". It is measured in "percentage", and the maximum humidity percentage is 100%.
Second, humidity can vary somewhat from one part of the house to another. Also, hygrometers (which measure humidity) can vary by several percentage points from one to the next, so don't interpret the readings as exact, but rather as approximate.
My gut feeling is that your air conditioning unit is probably not running enough during the summer months if your electric bill is that low. I suggest that you set the activation point on the AC to kick on at a slightly lower level.
Also, you should know that wide variations in temperature are not good for your furnishings in the house, and you are not controlling the temperature at all which you may want to reconsider. Wide temperature swings can result in considerable expansion and contraction of the furnishings in the house as well as the house walls, ceiling, and floors, etc. This can lead to cracks in the drywall, floor tile, and possibly even the furniture.
BTW, it doesn't cost much to get a smart thermostat that controls for both temperature and humidity.
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