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These are the possibilities for you to consider: o Decide whether to install a heat exchange system. o Fit controllable trickle ventilators in each room to obtain cross ventila¬tion (the ease with which these can be fitted to existing windows varies with the type of window). Ventilation strategies. o Install mechanical extractor fans in kitchen and bathroom, controlled by a timer or humidistat (moisture control switch). o Install permanent roof ventilation system for combustion appliances which rely on a supply of air from inside. you will of course always have the option of simply opening windows as required. It is up to you how sophisticated a system you devise. Remember that in a tall house in very cold or very windy weather, whatever system you have will need to be closed right down as the pressure differences will force air through much smaller openings. Whatever you decide, it is important to develop a ventilation strategy that fits your home the way you use it. o Use defunct chimneys as channels for ventilation or ducting. This may be particularly useful if it is difficult to fit ventilators to the windows. Consider also using your chimneys to recirculate warm air to upper storeys or vice versa. o Install air-cleaning measures: either mechanical or biological, ionisers or filters. If the main problem is humidity then consider using a dehumidifier and if lack of humidity then consider a misting humidifier or again the use of plants. o Opening and closing windows as necessary: if external doors are constantly being used, this may provide sufficient ventilation for much of the day.mould prevention is also the need.
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