Types of system

An automatic ventilation system is a much more effective way of reducing condensation than using a dehumidifier. And it's much more convenient than having to open and shut windows.

There are 2 main types of ventilation systems:

• Positive pressure or forced air ventilation systems work by blowing drier air into your house from the roof space above the ceiling or, in some types, from outside. They suit older houses with wooden joinery better than modern houses with sealed aluminium joinery – unless windows are opened or additional vents fitted.
  
  Read more about positive pressure systems.
   
• Balanced pressure / heat exchanger ventilation systems extract warm damp air from living spaces and pass it through a heat-exchanger to heat up dry air which the system brings in from outside. This can fully meet Building Code requirements. They work best in more airtight, modern homes.
  
  Read more about balanced pressure systems.
   

Which system is best?

This depends on the design of your house, its floor area, the location, how much sun the house gets, the type of roof ... even the local climate.

Before you install any system, do some homework. We've outlined how the different designs work and some of their pros and cons which should help you decide whether your house is suitable for any of the systems available. Consider what you want to achieve against the types of system – and also look for any extra features you might need to meet your particular requirements.

For best results, a system should be designed specifically for your house and your needs. But this can be quite costly, especially if you choose a fully automated system with multiple outlets or other options.

We recommend getting quotes from several installers who are familiar with your local climate.