Humidifiers

One thing that can make a huge difference in the environment in your room is a humidifier, air purifier or a dehumidifier.

In terms of humidifiers, it can really help your room in the winter when it gets really dry... I personally know people who occasionally get nose-bleeds from the really dry weather. A humidifier can also help when you get really dry skin in the winter by not drying your room out even more.

An air purifier can also really help you out by clearing the air in your room. This is really good for people who have allergies. You do not have to get a man-made machine to be an air purifier because there are some that occur in nature, such as the spider plant. However these are not as heavy duty as an actual air-purifier that you would buy form the store.

Lastly is a de-humidifier. A dehumidifier comes in handy for the summer when it can get really humid outside. I do not suggest running a humidifier and a dehumidifier at the same time, because I am pretty sure that they will wind up cancelling each other out.

These items can be bulky and difficult to store so I suggest only having one at a time in your room, and also they are typically seasonal so that can be good for storing them.