This really depends on where you live. If you are on the Highveld where the normal humidity is low during the winter so it is good to use a humidifier.It will be of benefit to your son. At the coast the normal humidity is high and it is usually not necesssary to use a humidifier. You can use a heater to warm your son's room but keep this on a reasonably low setting so as not to make the room too hot and also so as not to dry the air in his room to much either.
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