5yrs
Never! If it's low on refrigerant it has leaked.
once a week is recommended
You should get your floor machines serviced once every other year. They require regular upkeep in order to last a very long time.
Annually. If it`s fueled with oil absolutely annually.
Your fuel tanks are built to last the lifetime of your vehicle. They should only need to be serviced if they are damaged in an accident, or if some contaminant has been added to the tank.
If it cycles off and on too often, it may not provide enough dehumidification. It takes awhile for the evaporator coils inside to get cool, which is when they provide adequate dehumidification.
When you need a window sized air conditioner unit repaired or serviced, start by calling the manufacturer. If the unit is under warranty, the manufacturer can tell you who services their units under warranty. Even if not under warranty, they often can tell you companies in your area that service their brand(s). However, consumers often find it is cheaper to junk the unit and buy a new one. With service call, parts, and time spent to repair it, the cost may be more than a new unit costs now.
once a year, or 15,000km whichever comes first.
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As often as its needed to get the room set to your set tempature.
Inspect at least once a year, base service on what you see.