I have a water tank that sits outside. It is turned on when it rains, and I use it to fill up the hose for my garden sprinkler system. If it does not rain for several days or even weeks after turning on the water tank, then I start noticing a lot of condensation in the upper part of my house because there is no air movement going through this area during these periods. There are vents in all four corners but I’m still seeing a lot of condensation dripping off the roof and walls everywhere except where there are windows open (but this has been happening since we moved into our newly built home). How can I stop this from happening? The house was built about 10 years ago so maybe something should be replaced or fixed?