whats best

hello everybody i hope you are all feeling ok with this horrid weather. quick question for you all. i was wondering what people thought of humidifier dehumdiifeir and air purifiers. i am thinking of getting one of these for my house but i dont know enough about them to go out and buy one. does anybody have one of these and if you do do they make any difference to your asthma. thank you all and happy breathing to you all xxxxxxxxxxxxxxxxxxxxxxxxx