3, IS the INSTALLATION GOOD?
Ensure the DryFan is working and you have followed the instructions on how to set the unit on the links on the left.
A small dehumidifier can dry a large warehouse given enough time and the right conditions. Likewise the largest dehumidifier will struggle to dry a swimming pool in a short time. Every home and situation is different. More people create more moisture needing a larger unit. A larger home will also need a larger unit or more than one unit may be required. To understand more see here
It is important to understand that every time air flows through the DryFan it is dried around 30% and does not dry the air 100% dry. Therefore, air must be allowed to cycle through the dehumidifier over and over to get the best drying affect.
Adequate and proportional air flow is needed. See the installation pages. If ducting prevents adequate air flow through the exhaust or through the process air then the system is not balanced.
Do not forget very few rooms are air tight. Often the air is completely changed every 1.5 to 2.5 hours even in a modern home. Any dehumidifier will need to dry all the incoming air plus the moisture produced in the room. If you calculate the volume of the room then the volume of air processed by the dehumidifier, you will get an understanding for the size of the dehumidifier needed or if more than one dehumidifier is required.
Check the air flow of the exhaust with and without ducting to ensure they are similar. Less total air flow or not enough air flow from either Purple or Green vents will means less dehumidification performance.