My bedroom feels constantly damp, so does my bedding and clothes. I cannot find the source of the problem. There is no dampness on any of the walls or floor and I cannot find any cracks that might be letting in air. Does anyone have any ideas?
I have the same problem. I simply run a room air conditioner to dry it out. I do this all year long too. Believe it or not, the ac in the winter, keeps the room at a more even temperature than depending on the furnace to keep warm and it also keeps the air clean and moving and fresh. I keep the temp at a comfortable 68 all year this way. It also only adds about 3$ a month to my electric bill.
You could also put a small container of Damp Rid in your room. We have to do this in our basement. (Keep out of reach of children & animals.)
I had this problem. Come to find out we had a hot water leak under the house and the mold was so large it hung from the house to the ground. Everything felt wet it took a lot of time and money to get rid of the mold.
Should help some anyway, many things you can do, extractor fan, and so on, dehumidifier as already suggested, and though defeats the object, when really cold out, normally closer to 0 (freezing), but below 5, have heater on, room around say 21 and open the window for a few minutes, if only a little way, not wide to let too much cold in, and this should help shoot the humidity down.
As for all the rest, I've done the work for you, so many links and information, you'll become obsessed about it like I did, but fascinating and interesting reading and you'll no doubt learn much and realize about your health being affected as well as the damage to your home because of excess or too low humidity in it.
THAT is your problem - no air getting in at all. It is not air from outside that creates damp, it is the lack of it. You need to air out the room constantly. That becomes a problem in the winter months, since it is cold and no one wants to open all their windows and let in cold air, but you really need to open the vents on the windows to circulate air around the room, if you do not open the windows. Condensation is created by cold meeting hot/warm. Condensation is bad on single glazing, that is why double glazing eliminates a lot of the condensation since the two sheets of glass do not let cold meet hot/warm.
Damp Rid is great for closets. I buy a container from the Dollar store and a big bag of refill crystals from Amazon. Once the crystals are used up from the Dollar store Damp Rid container I refill it from the big bag. It is amazing how much moisture you can remove from a closet.