Why is there no button to turn off the heat like there is to turn off the AC?
Use case: in the summer, I might set the AC to the high end of the temperature range that I feel comfortable at. But, in the evening, that may cause it to turn on the heat, even though I would rather have it not use either AC or heat at all, since the evening temperatures are within the comfortable range. This requires manually turning off the AC and setting the temperature to near the low end of the possible range. If there were a button to turn off the heat, then this would not be necessary to prevent the heater from turning on in the evening.
Use case: in the summer, I might set the AC to the high end of the temperature range that I feel comfortable at. But, in the evening, that may cause it to turn on the heat, even though I would rather have it not use either AC or heat at all, since the evening temperatures are within the comfortable range. This requires manually turning off the AC and setting the temperature to near the low end of the possible range. If there were a button to turn off the heat, then this would not be necessary to prevent the heater from turning on in the evening.