went on a call today unit was completely frozen . The homeowner asked do the air filters disolve ? I replied no why do you ask. she said well I go to change the filter once a month & sometimes its not there anymore. I couldnt see down the r/a duct for all the filters . Broke loose the duct & pulled out 15 filters, put two bracebars on the r/a grill - problem solved & had my laugh for the day. closes thing I've had to this was the homeowner that changed the filter every two months & when asked why every two months he replied : I use one side this month & then flip it over & use the other side next month.