There are a number of benefits to having an indoor thermometer in your home and the health of your family is usually of the highest priority. To maintain optimal temperature and humidity levels, you need to know what these ranges are first. You can then decide if you need to raise or lower the temp/humidity in your home.
The other benefit is that you can save a lot of money on utility bills. One of the biggest factors that can increase a utility bill is a faulty heating or cooling system. An indoor thermometer can give you a good indication of whether or not these systems are functioning efficiently. As an example, if your heating system is constantly working but the thermometer shows a lower than comfortable temperature, this could be an indication that your heating system is not working efficiently and needs fixing/replacing.