Problems
High indoor humidity, even with the AC running
The AC is running, the room is cool, and the air still feels sticky at 65 % RH. That is normal: an air conditioner controls temperature, and only removes moisture while its compressor runs. Once the room is cold it stops. A ducted dehumidifier holds humidity on its own humidistat, whatever the AC is doing.
Site survey · sizing · installation · maintenance, UAE-wide
What you are seeing
Cool but clammy rooms
The thermostat says 22 °C and your skin says damp. Temperature and humidity are two different readings.
Fogged glass and damp bedding
Sheets feel cold and damp at night; the windows carry water in the morning. The room sat above its dew point.
A humidity meter reading above 60 % with the AC on
A hygrometer settles the argument. One Dubai inspection measured 88.5 % RH at the AC supply vent itself.
Why it happens
An air conditioner removes moisture only as a side effect of cooling, and only while the compressor runs. When the room reaches the set temperature the compressor stops, the fan keeps blowing, and the wet coil can even give moisture back to the air. An oversized unit cools so fast it barely dehumidifies at all.
Dry mode helps for a while but, as LG's own guidance puts it, cannot usually hold a target humidity level. In a sealed apartment with showers, laundry and cooking, that is not enough.
A dehumidifier is controlled by humidity, not temperature. A ducted unit above the ceiling holds the setpoint you choose and lets the AC do its own job.
What changes with a ducted system
Humidity controlled separately from temperature.
A setpoint you choose, held day and night and while you travel.
You stop fighting humidity with the thermostat.
Which system fits
Each pick is a product family, not a model. The survey decides the capacity and the number of units; nothing is sized by floor area alone.
Typical system
Series R: recirculating ducted dehumidifier
Dries the air already in the building and returns it through its own ducts. The usual choice for villas, apartments, offices and basements.
The room air needs drying independently of the AC. A recirculating unit above the ceiling returns air from the rooms, dries and filters it and supplies it back on its own humidistat.
- Ceiling void of a corridor or bathroom
- Dedicated return and supply grilles
- Drains to the AC condensate line
Typical system
Series T: ducted fresh-air treatment unit
Treats the fresh air before it reaches the rooms: filters it, dries it and exhausts the stale air.
When the fresh-air supply, or the AC's own intake, is what brings the moisture in, the treatment unit dries that air before it reaches the rooms.
- Fits the fresh-air path
- Removes the humid supply-air problem at the source
- Combined with Series R where the rooms also need recirculation
How we fix it, in order
- 01
Measure where the moisture comes from
Readings in each room, at the AC supply vents and at the fresh-air inlet; how the AC is sized and used; ceiling void, drain and power.
- 02
Size for the home, not the AC
Volume, glazing, occupancy, bathrooms and fresh-air supply set the load. Capacity is a datasheet figure.
- 03
Install, set the humidity, hand over
Unit above the ceiling, ducts, grilles, drain and the wall controller next to the AC thermostat. A readings report confirms the setpoint is held.
Projects in this space
Every installation is documented with dated humidity readings, photos and the owner's consent. Nothing is published before it is real; the first case studies are being written.
Questions about humidity with the AC on
Why is my house humid even with the AC on?
Because the AC is controlled by temperature. It removes moisture only while the compressor runs, stops when the room is cool, and in a sealed home the moisture from showers, laundry and the fresh-air supply keeps coming. The guide below goes through the causes one by one.
Is AC dry mode enough?
For a mild month, sometimes. In summer it eases the air for a while but cannot hold a target humidity, and it cools the room whether you want it or not. A dehumidifier holds the level you set.
What level should I aim for?
Below 60 % RH to stay out of mould territory, around 50 % for comfort. A cheap hygrometer in the bedroom tells you where you are now.
Does the dehumidifier cool the room?
No. It removes moisture and returns the air slightly warmer than it took it. The AC keeps controlling the temperature; the two systems are never connected.
Related guides
Guides
Why your house is humid even with the AC on
Oversized AC that short-cycles, supply air at 88% RH, sealed glazing and night-time humidity. Eight UAE causes, how to measure, the fix that holds 50% RH.
Read the guideGuides
Dehumidifier vs air conditioner dry mode
AC removes some moisture while cooling but cannot hold a set humidity; dry mode helps in April and October only. Latent vs sensible cooling, and the fix.
Read the guideGuides
The ideal indoor humidity level for a UAE home
45 to 55% RH is the comfort and mould-safe band; above 60% mould and dust mites take off, below 40% static and dry skin. What each level feels like.
Read the guide
Talk to an engineer, not a call centre.
Send a photo of the problem and a floor plan on WhatsApp. An engineer replies with the next step, not a script.
- An engineer answers, not a sales desk
- Site survey before any quote
- Installation and service across the UAE
Tell us the space. We size it and quote it.
A floor plan or a few photos on WhatsApp are enough to start. A survey confirms the rest.