Cathy
This is a 'cut & paste' from 'Our House', a TV article on Mould Solutions.
The gadget solutions seem a great idea, however, providing one means you are responsible for its safety & maintenance etc.
My vote would be the fans. - Just as a matter of interest, have you ever 'taken the temperature' of a room at different heights? I rented a small house for a time, and no matter the efforts of the wall furnace, I was forever 'walking' through hot and cold spots throughout the house.
I was amazed to find that the air at floor level was ten degrees !!! colder than the air just under the ceiling. And with no ceiling fan, there was no way of circulating that expensive heat back to where I was sitting with a blanket over my knees.
Should your tenants decide to turn the fans on, they may notice a significant improvement in comfort, with noticeably lower heating costs for the remainder of the winter. And no more mould!!
Good luck
Kristine
http://ourhouse.ninemsn.com.au/ourhouse/factsheets/db/gizmosandgadgets/02/280.asp
QUOTE ...
Damp clothes, rotting floorboards and curling photographs are all signs of mould and mildew in the house. It is a common problem with some very simple solutions. Just choose the mould-buster that best suits your home.
Wardrobes, walls, ceilings, curtains and furniture are the most common victims of mould and mildew. It can also cause condensation on windows and ruin books, papers and clothing. Not only is mould an eyesore, but it can also be unhealthy, particularly for allergy and asthma sufferers.
Combined with natural humidity, the steam and moisture created by cooking, showering, bathing and washing can result in mould. It is particularly common in tropical and sub-tropical parts of Australia where the air is damp and hot.
There are two common ways for stopping mould — above or below the floor. Sub floor ventilation includes wind powered turbos, electrical fans and vents. Above the floor preventative treatments include dehumidifiers and wardrobe heaters.
SUB FLOOR VENTILATION
Start by having the sub floor ventilation in your home checked. Many houses suffer from inadequate ventilation due to poor sub floor venting, but aren't aware they have a problem. Make sure you get professional advice — too much sub floor ventilation can be just as bad as too little.
Mould often grows under houses with inadequate ventilation. You can prevent mould by installing extra vents (passive vents) or force fan ventilation (wind turbo).
Wind powered turbo ventilation systems can be installed in situations where it is not practical to install Anti-Damp vents, such as areas with high soil levels or homes with little access (semis or terrace houses). They are mounted on a 100mm or 150mm pipe and often used in conjunction with Anti-Damp vents. Fans are also available, however they have a limited life span.
Anti-Damp vents help remove musty smells, mould, fungi and rotting floorboards in the sub-floor area.
The advantages of good sub floor ventilation:
Prevents fungi, mould, rotting boards, musty smells, bowing timber and lifting lino or vinyl tiles.
Discourages termites by creating an airy, light environment.
Eight times the air flow of standard terracotta vents.
Promotes a healthy living environment for people with respiratory conditions.
No running costs and minimal maintenance required.
ABOVE THE FLOOR TREATMENTS
Wardrobe Heaters:
Wardrobe heaters fight persistent mould and mildew in the closet. We looked at Dampp-Chaser Closet DeHumidifiers that warm, dry and circulate wardrobe air, effectively stopping mildew, mould, musty odours and rust. As an added bonus, they are simple to operate — just set them and forget them.
Dampp-Chaser Closet DeHumidifiers are mounted on the baseboard (or the wall above the baseboard) with brackets and plug into the nearest power point. Don't use staples on the electrical cord and make sure you keep the heater horizontal. The DeHumidifier circulates the air in the closet 150 times a day and can be left on during most seasons (it uses very little energy).
De-Humidifiers:
Dry home DeHumidifiers quietly remove large amounts of water from the air. They are portable and can be easily rolled from room to room. When the DeHumidifier's four litre water container is full, it will automatically shut down.
DeHumidifiers have non-corroding parts, fan motors, adjustable dryness control and a two year guarantee. There are three Dry Home models to choose from, all with varied powers.
Cost
Above Floor Treatments:
Dry Home sell a range of dehumidifiers, air purifiers and wardrobe heaters. Wardrobe heaters cost between $70 and $100 (plus delivery). Dehumidifiers cost between $700 and $1000.
...UNQUOTE.