Found air conditioner freezing -checked air filter -found customer using very restrictive filters -customer stated use of restrictive air filters is due to medical conditions recommend upgrading filter system to allow less restrictive filter system customer was concerned with air quality -attached are quotes for various air quality upgrade options(all are 100% optional) -if there are any questions regarding IAQ options please let us know found air conditioner freezing due to being low on refrigerant condensing coil is really dirty Cleaned condensing unit coil charged system with 410A refrigerant