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If you mean any home and water heating and air conditioning units, the main reason is to clean out the dust, fluff, etc. which accumulates inside the units from all the air passing through them. This stuff will clog these units up badly if they are not serviced regularly. Depending on the quality (clean-ness) of the air in the locality, any air filters, fans and ducting should be cleaned-out at least once a year. Doing this will make sure they are running safely and efficiently and help to prevent future problems in operation. Regarding oil- or gas-fired boilers and air heaters, there is also an important safety reason why they should be serviced every year. This to check that no dangerous fumes are leaking out of the unit's housing which could kill the people in the room or the house where it is fitted. Such dangerous fumes include Carbon Monoxide (CO), which is a very dangerous suffocating gas but is quite odorless.

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Q: Why does heating need to be serviced every year?
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