Dehumidifiers near you

The investigation is worth paying for, because it is the difference between one repair and a permanent electricity bill. A competent assessment of an Australian house works from outside in and from underneath up, and none of it requires a dehumidifier to be present.

A refrigerant dehumidifier works like an air conditioner that keeps its water: air is drawn over a cold coil, moisture condenses out, and the drier air is returned to the room. It is efficient in warm, humid conditions, which makes it the natural choice for Brisbane, the northern rivers, Darwin and a Sydney summer. Its weakness is cold: as the room temperature falls, the coil approaches freezing, the machine spends time defrosting instead of drying, and its output drops away.

A desiccant dehumidifier passes air over a moisture-absorbing wheel and then drives the collected water off with heat. It does not care about cold, so it keeps working in an unheated Hobart or Ballarat house in July, in a garage or in a subfloor space where a refrigerant unit would struggle. It uses more electricity for the same water removed and warms the room slightly, which is sometimes welcome and sometimes not.

Because a refrigerant dehumidifier contains a sealed refrigerant circuit, it is refrigeration and air conditioning equipment. The Australian Refrigeration Council states that any person who handles refrigerant or works on such equipment must hold a refrigerant handling licence, and that under the regulations it is an offence of strict liability to handle fluorocarbon refrigerant without the appropriate licence. That matters if a unit ever needs repair rather than replacement.

Ventilation is the right answer when the air inside is wetter than the air outside, which in a southern Australian winter is often the case for a house generating moisture indoors. Opening up on a dry afternoon and running the exhaust fans while showering and cooking removes moisture at no running cost. It is the wrong answer in a humid subtropical summer, when opening the house imports moisture rather than exporting it.

Air conditioning dehumidifies as a by-product of cooling, and in humid coastal Australia that is a large part of what makes a conditioned room comfortable. What it does not do is manage moisture in a space you are not cooling, such as a closed-up holiday house, a garage, a wardrobe-lined hallway or a subfloor, and an oversized air conditioner that reaches temperature quickly can leave a room cool and clammy because it never ran long enough to remove much water.

A dehumidifier is the right answer for the spaces and seasons the other two cannot reach: an unheated room in a damp southern winter, a closed house in the wet season, a space being dried out after a leak, and a building that has a manageable residual moisture load once the fixable sources have been fixed. Sequence matters more than choice: source first, ventilation second, machine third.

The wet season across northern Australia and the summer humidity of the east coast are the obvious high points, and that is when refrigerant dehumidifiers do their best work. Less obvious is the southern winter, when a Melbourne, Adelaide, Hobart or highland house is closed up, unheated in parts, and quietly accumulating moisture from cooking, showering, breathing and drying clothes indoors. That is the season in which mould appears in wardrobes and on the walls of rooms nobody uses.

The shoulder seasons are when the fixable work should happen. Clearing subfloor vents, correcting drainage, ducting an exhaust fan to outside, tracing a leak and replacing an unflued heater are all jobs better done in autumn or spring than in the middle of the problem. A dehumidifier bought in the first damp week and left running for years is what happens when the shoulder season passes without anyone doing them.

Two different spends are in play. The appliance is a purchase, and the things to weigh are the room volume it is rated for, whether it is refrigerant or desiccant given your climate, whether it can be plumbed to a drain, the noise level if it will run in a living area, and how easy the filter is to clean. The investigation and the repairs are a job, and their cost depends entirely on what is causing the moisture, which is why a diagnosis comes before a quote.

LokalMatch is where the job starts, not where it ends. Describe what you are seeing, where in the house, at what time of year, the floor construction and your postcode, and building, plumbing, ventilation and restoration businesses covering your area contact you directly; those businesses pay LokalMatch for the requests they receive. LokalMatch does not do the work, does not set or quote prices and does not vet, rank or recommend anyone, so ask for the source of the moisture to be identified in writing before you accept a proposal to manage it.