Heat Recovery Ventilation: Fresh Air Without Energy Loss

Heat recovery ventilation (HRV) is a crucial component of passive houses, ensuring a constant supply of fresh air while maintaining energy efficiency. This advanced ventilation system recovers heat from outgoing stale air and uses it to warm incoming fresh air.

Why is Heat Recovery Ventilation Important?

In a passive house, HRV systems serve multiple essential functions:

Energy Efficiency: Recovers up to 90% of heat from exhaust air
Air Quality: Provides continuous fresh air supply without opening windows
Comfort: Maintains consistent temperature and humidity levels
Health: Filters out pollutants, pollen, and dust
Moisture Control: Prevents condensation and mold growth

How Does Heat Recovery Ventilation Work?

The HRV system operates through a simple but effective process:

Exhaust Air Collection: Stale air is extracted from kitchens, bathrooms, and other humid spaces
Heat Exchange: The warm exhaust air transfers its heat to the incoming fresh air through a heat exchanger
Fresh Air Distribution: Warmed fresh air is distributed to living spaces and bedrooms
Continuous Operation: The system runs 24/7, ensuring constant air quality

Benefits of Heat Recovery Ventilation

Energy Savings

Recovers 80-90% of heat from exhaust air
Reduces heating costs significantly
Maintains comfort with minimal energy input

Improved Air Quality

Constant supply of filtered fresh air
Removal of indoor pollutants
Reduction in allergens and dust

Comfort and Health

No cold drafts from opening windows
Consistent temperature throughout the house
Reduced humidity and condensation
Better sleep quality due to fresh air supply

Installation and Maintenance

For optimal performance, HRV systems require:

Professional installation by certified technicians
Regular filter changes (typically every 6-12 months)
Annual inspection and cleaning
Proper ducting design and installation

Integration with Passive House Design

HRV systems work in harmony with other passive house principles:

Complements superior insulation by preventing heat loss through ventilation
Works with airtight construction to control air flow
Contributes to overall energy efficiency goals
Helps maintain consistent indoor temperature

Conclusion

Heat recovery ventilation is not just about fresh air – it's a sophisticated system that maintains comfort, health, and energy efficiency in passive houses. By recovering heat from exhaust air, these systems ensure that ventilation doesn't compromise the energy performance of your home.