These two appliances do opposite jobs, and asking whether you need “both” is really two separate questions.
The same room, different seasons
A room can run damp in autumn from condensation, then dry out considerably once central heating runs constantly through winter. That’s a genuine, common pattern, and owning one of each — used at different times of year — isn’t wasteful in that case.
The same room, same week — check ventilation first
If a room seems to need both within the same short period, that’s often a sign of a ventilation problem rather than a humidity problem that needs two machines to fight simultaneously. Improving airflow may fix more than either appliance would alone.
Different rooms, different needs
A bathroom prone to condensation and a bedroom that feels dry and static in winter are two different rooms with two different, unrelated problems — needing an appliance for each isn’t the same as needing both for one room.
What we would not do
Buy both preemptively without measuring first. A thermo-hygrometer in each room for a week or two tells you whether the actual pattern justifies owning both, rather than guessing from general seasonal assumptions.
The questions that keep coming up
Can I use both in the same room on the same day?
It would be unusual and counterproductive — they do opposite jobs. If a room needs both at different times, that's normal; needing both simultaneously usually means something else is wrong, like poor ventilation.
Last reviewed 24 August 2026