Prior to my testing this unit, I had been testing 2 smaller units from other manufacturers that were each rated to do about 500 square feet each. Even with both of these smaller units running at the same time, I had been unable to maintain the humidity level below 57% even with both units running almost continuously.
In fact the lowest reading I had been able to reach, but not maintain, had been 53%.
I then set up theComfort-Aire 65 pint low temp dehumidifier for constant draining with the easy-to-use draining tube that is included, put the fan speed on low, and turned the unit on along with just one of the smaller units. Within 6 hours the humidity had dropped to 43%. So I turned off the smaller dehumidifier unit since it was clearly not needed, and just left the Comfort-Aire running. The Comfort-Aire was set for 50% humidity and has been maintaining a 50% level on low fan speed ever since. I have also tested the Comfort-Aire dehumidifier with the setting at 45% and it seems to maintain that level as well, but since I only need to keep the humidity at 50% to prevent mold, I have reset it to run at 50% to save electricity. The unit is relatively quiet and the fan and compressor both shut off when the humidity level has been reached. It is the best residential basement dehumidifier I have tested.