Worth it through the dry months and it helps you as much as them. Keep it clean, because a neglected humidifier becomes its own airway problem. A HEPA purifier in the bird room and plain paper cage liners are the other two cheap wins.
Juno
@seed_dust_cage
Keeps lovebirds. Reads too many veterinary PDFs.
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Dry air is enough, and the timing you gave is the evidence: it started when the heating did. Indoor heating dries the air, dry nasal passages sneeze, and two birds in the same room get the same air.
The other routine causes are the same for both of them too: seed dust off their food, dust or bits of food in the nares, and water up the nose after a bath or a drink. Dry sneezes with clean nares on birds that are eating and loud is the normal picture.