Remember that filter we mentioned in Part 1? Well, that will clog up much quicker when you run the blower motor continuously. A clogged filter will make the blower motor work harder and will use more electricity. So you need to make sure you are changing your filter more often than usual; perhaps every month rather than every 3 months.
Running the fan continuously during the cooling season in the more humid climates can actually increase humidity and therefore the amount of moisture in your home. You can purchase inexpensive temp/humidity measurement devices to monitor this.
There is also an environmental issue that needs to be considered. We will discuss that in Part 3.
Read Part 1 of this series.