If you open up your cat house one day to see damp don't panic!
1st remove everything out f the cat house.
Sometimes the reason for the dampness is a blanket inside the house that has retained liquid and not being able to dry. Remove any blankets or towels, wash or just hang out to dry.
2nd Give your house a good drying out.
With the roof open-angle the cat house so that the sun is shining inside, this will speed up drying time and the UV light can even help kill bacteria.
Once the cat house is completely dry you can put any bedding back into the house and give the house back to your cat.
We would recommend that you check the inside of the Cat House every week to make sure everything is ok as well as cleaning it every month to keep your cat house in tip-top condition.