Allan Reid, double-glazed windows expert at Art Windows and Doors, says that taking a proactive approach to ventilation now is essential. The solution isn't to open windows all day, which would make the house cold, but to ventilate smartly and at the right time." Here are some expert tips for keeping mould away from your home, including a 'one-time rule'. Here's how to stop mould and damp from taking holdThe 'one-time' ruleAllan at Art Windows and Doors recommends not opening windows during the day when it's cold outside. Recommended reading:“The respiratory effects of damp and mould can cause serious illness and, in the most severe cases, death”.