The #1 reason for mould is heightened humidity in the home.
Here are some recommendations to avoid condensation & prevent mould growth.
Bathroom and Kitchen Fans
Use your bathroom and kitchen fans every time you cook or shower. Showering and cooking releases a lot of moisture into the air, and sometimes this moisture cannot escape from your house easily. The exhaust fans in your kitchen and your bathroom help remove this moisture from the air. You want to run the fans for about 15 to 20 minutes after you shower or cook.
Circulate the Air
Circulating the air can help reduce condensation on your windows. Use your ceiling fans even in the winter. You want the fans to rotate in a clockwise direction to push warm air off of the ceiling back down to the floor.
Raise the temperature and keep it consistent
Condensation occurs when warm air hits a cold surface. Think about taking a cold drink out of your fridge on a warm day. The surface immediately gets wet. Keeping the temperature in your home warm and consistent helps reduce condensation.
Open Your Windows / Air to Air Exchanger
If it isn’t too cold, you can open your windows. This will release some of the warm, moist air that is trapped in the house. An air to air exchanger is another fairly easy way to reduce moisture in your home, and therefore condensation. An air to air exchanger brings in fresh air from the outside and sends indoor air to the outside. In additoin to removing moisture, these machines also remove pollutants from your home.
Buy a Dehumidifier or Moisture Eliminator
Purchasing (or renting) a dehumidifier is an easy way to remove the moisture in your home. If you suspect that there is excess moisture in smaller areas of your home, you can purchase a moisture eliminating product, such as DampRid. These products often come in buckets that you can set on your floor or in bags that you can hang, typically in your closet. You can use these products in your bathrooms, kitchen, or closets (where they will also help protect your clothing from moisture damage), and they will remove excess moisture from the air.
Turn Down the Humidifier
You might notice condensation in your bathroom, kitchen, or nursery. In the nursery this problem is often caused by a humidifier, which many parents use. If you use a humidifier in any part of your home (including the humidifier that works with some furnaces), you can try turning it down. As a result, the humidifier will release less moisture into the air, which will hopefully reduce condensation.
Move Your Plants
Plants release moisture into the air, so if you have a number of plants by your windows, moving them to a different place can help reduce condensation.