Opposite problems
Dry air is the humidifier's problem: air that holds too little moisture, which feels harsh on skin and airways, especially in winter, when heating dries the air further. Damp air is the dehumidifier's problem: air that holds too much moisture, which feels clammy, encourages mould, and damages goods and buildings. The two problems feel different, look different, and need opposite products.
A buyer who needs a humidifier but orders a dehumidifier will make dry air drier, and a buyer who needs a dehumidifier but orders a humidifier will make damp air damper. The error is not a minor mismatch: it worsens the very problem the buyer wanted to solve. Naming the problem — dry or damp — in the inquiry prevents it.
How to tell which problem you have
Dry air feels tight on skin, cracks lips, and makes throats scratchy in the morning, especially in heated rooms in winter. Damp air feels clammy, leaves condensation on windows and walls, and smells musty, especially in basements and poorly ventilated rooms. The two feelings are distinct, and a room that feels one way in winter may feel the other way in summer, because seasons change the air.
If you are unsure, describe the room and its symptoms in the inquiry, and let the supplier confirm which product family fits. An honest uncertainty, described precisely, will receive a careful answer, while a guess presented as certainty will receive a product for the wrong problem. The humidifier selection guide explains the humidifier side, and this guide explains the distinction.
What to ask next
Name the problem — dry air or damp air — and the room it affects, the quantity you have in mind, and the market you sell into. If the problem is dry air, ask for the humidifier specification, quantity terms, lead time, and certificates for your market, by name, with documents attached. If the problem is damp air, say so, and do not order a humidifier for it.
Before payment, confirm the minimum order quantity and lead time for your order. Certificates are available upon request.