Best Answer: thermostat should ideally be placed around 4 to 5 feet up (at or around the level of your light switches) .It senses the air temperature from the level you are at therefore keeps you more comfortable.Something else you could do is balance the registers (grills) to adjust desired airflow throughout the house/apartment. ...It should not be placed up on the ceiling unless you spend a majority of your time up there. Source(s):t senses the air temperature from the level you are at therefore keeps you more comfortable. Something else you could do is balance the registers (grills) to adjust desired airflow throughout the house/apartment. ...It should not be placed up on the ceiling unless you spend a majority of your time up there. Source(s):