Domakihub How to Dehumidify a Room and Stop Moisture Damage
Practical steps to lower indoor humidity in Greek homes, rentals, and hotels — fast.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Greece's warm, humid summers and damp winters push indoor humidity well above the comfortable 40–60% range, leading to mould, musty odours, and damage to furniture, walls, and textiles — a particular headache in coastal holiday rentals and basement rooms. The video above shows a professional whole-house dehumidifier installation in detail; this guide gives you the practical steps you can apply right now, from a cheap desiccant fix to a permanent electrical solution. Work through the steps in order and you will feel the difference within hours.
Why Humidity Is a Bigger Problem in Greece Than You Think
Greece's island and coastal properties regularly see relative humidity (RH) climb above 75% in summer, driven by sea air and limited cross-ventilation in traditional stone or concrete construction. Rooms that face north, lack windows, or sit at basement level are especially vulnerable, and the problem compounds quickly: above 65% RH, dust mites multiply and mould colonies can establish themselves on walls within days.
Hotels and holiday rentals face extra risk because rooms stay shut between guest arrivals. A single week of unventilated high humidity is enough to leave a damp smell that puts off guests and triggers negative reviews. Monitoring and controlling humidity is therefore a maintenance task, not a luxury.
How to Know When a Room Needs Dehumidifying
You do not need expensive equipment to spot a humidity problem. Condensation on windows or tiles, a persistent earthy smell, soft spots on plaster, peeling wallpaper at the corners, and visible grey or black patches on ceilings or grouting are all reliable warning signs. A basic digital hygrometer — available online for under €10 — will give you an exact reading; anything consistently above 65% RH calls for action.
In Greek summer the worst hours are early morning and late night, when outdoor air cools and pushes humidity indoors. If you open windows for ventilation, do it during the dry, warm midday hours rather than at night.
5 Steps to Dehumidify a Room Effectively
- 1
Measure first — buy a hygrometer
Before spending money on equipment, clip a digital hygrometer to a wall at chest height and leave it for 24 hours. Note the peak reading. This tells you how severe the problem is and gives you a baseline to measure your results against. A reading below 60% RH needs no active treatment; 60–70% calls for ventilation and desiccants; above 70% needs a plug-in or whole-house dehumidifier.
- 2
Ventilate at the right time of day
Open windows and interior doors during the warmest, driest part of the day — typically 11:00 to 16:00 in Greece — to flush moist air out. Use a box fan facing outward in one window and leave a second window open on the opposite side of the room to create a cross-draft. Even 20 minutes of active ventilation in the correct conditions can drop RH by 5–10 percentage points.
- 3
Remove moisture at the source
Attack humidity where it is generated: always use an extractor fan when cooking or showering, dry laundry outdoors or in a dedicated ventilated space rather than inside rooms, and cover pots while cooking. In bathrooms, leave the extractor running for 15 minutes after showering. These habit changes cost nothing and can reduce a room's average RH by 5–8% on their own.
- 4
Deploy a desiccant or portable electric dehumidifier
For rooms up to about 25 m², a passive desiccant tub (calcium chloride crystals sold as Humydry or Rubson in Greek supermarkets) absorbs moisture silently with no power needed — useful in wardrobes, storage rooms, or closed holiday villas between lets. For larger spaces or readings above 70%, a plug-in compressor dehumidifier rated for the room's floor area is far more effective. Set its built-in humidistat to 50–55% RH and let it cycle automatically; empty the water tank daily until the room stabilises.
- 5
Seal air leaks and insulate cold surfaces
Cold surfaces — exterior walls, single-glazed windows, uninsulated pipes — act as condensation magnets. Fit draught-excluding tape around window frames, add internal wall insulation where practical, and lag cold-water pipes. Once cold bridges are reduced, your dehumidifier or desiccant works far less hard to maintain target humidity. In holiday properties, this one-time investment dramatically reduces the maintenance burden between guest stays.
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FAQ
- What is the ideal indoor humidity level for a home in Greece?
- The World Health Organization and most HVAC guidelines recommend 40–60% relative humidity for occupied rooms. In Greek summers, aiming for 50–55% is a realistic and comfortable target. Below 40% air feels dry and irritates airways; above 65% mould risk increases and dust mites thrive.
- How long does it take a portable dehumidifier to dry out a room?
- A correctly sized compressor dehumidifier will typically reduce RH from 75% to 55% in a sealed room (25–30 m²) within 6–12 hours of continuous running. Very damp rooms or those with ongoing moisture sources — such as a slow leak or rising damp — may take 24–48 hours and will need the underlying problem fixed first.
- Can I just use my air conditioner instead of a dehumidifier?
- Air conditioners remove some moisture as a by-product of cooling, but they are not designed to control humidity precisely and stop dehumidifying when the room reaches the set temperature. A dedicated dehumidifier runs independently of temperature and maintains consistent RH levels, making it a better choice for damp rooms in autumn, winter, or during mild Greek springs when you do not need cooling.