Well the dryness is starting to set in here in our house. I need to get a new humidifier for the main living spaces to help this. I also need to get more filters for the furnace. I’m trying to figure out if there are truly differences between types of filters as I am seeing filters that say AC filters and some that say Heating filters. Has anyone ever used different types or do you always buy the same type all year long? My thoughts are that during the winter we almost need higher end filters because when it’s dry in here the allergens float even more but I’m not sure.