GeneralAire recommends once a year, just as heating season starts.
A Bionaire humidifier with a permanent filter will never need to be replaced. Yet it is necessary to make sure that the filter is cleaned properly on a regular basis.
An atomizing humidifier is one that shoots a steady stream of mist or vapor into the air. This type of humidifier needs to be checked often to make sure it has enough water to operate.
It is likely bacterial growth and should be thoroughly cleaned and removed and the chamber sterilized before using again. If possible the water chamber should be replaced. Check with your insurance to determine how often this is covered.
Hot gas from the discharge line of the compressor is routed into the evaporator or electric heating elements are embedded into the evaporator fins. Hot gas is often more efficient because no outside power source is needed to defrost the evaporator coil.
A steam humidifier is often used to clean the air, particularly useful for people who suffer from asthma. Steam humidifiers can also help those with a sore throat or dry eyes.
Water in the humidifier should be changed daily. Empty the humidifier chamber in the morning after you wake up, and fill it with fresh distilled water in the evening before you go to bed.
Under ordinary operating conditions, a Venta humidifier should be cleaned once every two weeks. Of course, in extreme conditions, more regular cleaning may be necessary to prevent bacterial buildup in the unit.
Mid 90's Jeeps have nearly a 100% failure rate in the A/C evaporator...if you have not changed the evaporator yet, it's almost certain it is bad. Compressors also go bad but not nearly as often as the evaporator.
They are replaced when they go bad.
The filters are what needs to be replaced most often on the air conditioning units.
Pancake Coils are often used as evaporator and condenser coils in refrigeration systems.
If you are talking about a damp-it, just take the damp-it and submerse it in a cup of water for about 5 minutes. Then take the damp-it out, dry it off lightly with a towel, and put the damp-it in the bottom circular part of the f-hole. Just make sure to wet your humidifier often.