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Option 2
Positive Input Ventilation or PIV

PIV, like dMEV is a whole house system. It supplies the home with fresh, filtered air on a continuous basis. But rather than extracting, it forces air into your home. This pushes out the stale air, and the moisture with it, through the gaps that should naturally ventilate your living spaces. The air changes up to 12 times every day, keeping your family supplied with a fresh, clean environment all day long. And to keep you cosy on long winter nights, the PIV system can be supplied with a built-in heater. This allows you to continuously, but gently, heat your home, keeping it warm and dry through the cold damp months.
 

Effectiveness ratio

Mild problems  ✪✪✪✪
Severe problems  ✪✪✪