The best thing you can do in your home during the winter months is to change your air filters. The white expensive ones Only need to be replace every 3 months. I say if you have 1 or 2 pets you should change it every two months Your home will smell fresher and you will have less dust and allergens in your home. The best reason to change it is for your wallet. A clean filter runs more efficiently and will cost you less money on your electric bill. Your air conditioner and heating system will also last longer.