A reading of 85 per cent relative humidity inside a closed drawer is already a warning. Most buyers lift the hydraulic base once a month to retrieve bedding, but rarely check the air quality inside the compartment. You might think the gap under the mattress provides enough airflow, but that assumption fails during the monsoon months. Air stagnates fast. In a 4-room BTO, the bedroom space is tight, so that air gets stagnant fast without a dedicated vent.
Storage beds with built-in sensors change the game. They track moisture levels automatically, alerting you before mould takes root on your stored winter coats. This data is critical because untreated wood absorbs water like a sponge in this climate. Particleboard frames soften quickly when humidity spikes, whereas plywood remains stable. The cheap wood will swell one. Solid timber handles the damp better than particleboard, but it costs more.
Ventilation holes alone are often insufficient for deep storage compartments. You need active airflow or a specific moisture management system. Some frames include passive vents along the sides, but those get blocked by the mattress weight. A sensor gives you the proof you need to verify the design works before you commit to the purchase. It stops you from guessing.
I recommend this feature for every HDB master bedroom where storage is essential. The extra cost is worth the protection against dampness. There is only one case where you might skip it. If you have a plain low platform frame without drawers, you simply don't need the sensor because there is no enclosed space. That is the exception.