Moulds and other fungi can grow in damp homes, particularly in areas where there is restricted ventilation, such as inside cupboards and wardrobes. These microscopic organisms release tiny lightweight spores which can be inhaled. If you smell a musty odour or see mould, you have a problem.
Moulds can produce adverse health affects, such as respiratory problems, nasal and sinus congestion, plus skin rashes and irritation. A damp mouldy house is bad for people’s health so it is important to keep your house dry to prevent mould growth.
Air contains moisture – this is called humidity. The higher the temperature of the air the more water it is able to hold. Air at 20°C can hold a lot more moisture than air at 10°C. The term ‘relative humidity’ describes how much moisture air contains at a given temperature. 100% relative
humidity means the air is holding as much moisture as it can at that temperature.
The more humid the air is in your house, the more energy it takes to warm your house because it is also warming the water in the air. This means it will be more expensive to heat!
A good range of indoor humidity for comfort and health is between 30-60% during cooler months of the year. Mould is likely to occur if the relative humidity indoors is 70% or more for long periods of time. Keeping humidity levels under 50% also helps to minimise or control dust mites. But it is also possible to live in a house that is too dry! Humidity levels below about 30% lead to dry skin and nasal passages, increasing the potential for respiratory illnesses.
It is worth buying a low cost humidity meter from a hardware store and track how humid the air in your house is. You might be surprised at how quickly it can change, from morning to night, from room to room, and as the weather changes.
When the humidity is high inside a house and it is cold outside the water vapour condenses on cold surfaces. The following areas might have problems with condensation and dampness:
Humid air and condensation can also be generated by things people do in their homes on a daily basis.
|Source of humidity/moisture||Litres of water vapour|
|Cooking||Up to 3 litres per day|
|Clothes washing||0.5 litres per wash|
|Showers and baths||1.5 litres per person|
|Washing dishes||Up to 1 litres per day|
|Un-vented clothes drying||5.0 litres per load|
|Unflued gas heater||0.5-1.0 litre per hour of use|
|Breathing, active adult||0.2 litres an hour per person|
|Breathing, adult asleep||0.02 litres an hour per person|
|Pot plants||A high number of pot plants or if you frequently water them will increase humidity in your house|
There are lots of things YOU can do to minimise dampness and condensation in your house.
Four key actions:
How Can Solarventi help the above
Low cost options
SolarVenti Solar air collector is suitable for holiday houses, family houses, work-shops, garages, cellars, storerooms, boats, caravans, annexes, museums and much, more..
A solar air collector which sends free, dry and warm air into the building – and is not connected to the main electricity supply.
The name of a series of patented solar panels which was introduced to the market in 2001.
SolarVenti have been in the business for 26 years and since 2002 we have installed more than 27,000 SolarVenti systems in 24 countries.
SolarVenti will exchange stale, damp indoor air with dry, fresh and warm air - between 20 and 120 m3 per hour each time the sun shines, depending on the relevant model. The air exchange will continue, year after year after year without any cost.
NO MORE damp bed linen, rusty knives and forks, and lumpy sugar in the bowl!
NO MORE unhealthy conditions for both the house and its occupants!
NO MORE dangerous conditions of mould and mildew growth!
Besides creating a healthy indoor climate, SolarVenti will give you both direct and indirect heat savings. Moist air requires more energy to heat than dry air - SolarVenti inputs dry air and supplementary heat - your heating system has to work less to heat the drier air, and because it is already warmed, you save even more energy.