How a Heat Recovery Ventilation System Improves Indoor Air Quality

• Works through two airflows: one removing stale indoor air, the other bringing in fresh air.
• A heat exchanger transfers warmth from outgoing to incoming air, saving energy.
• Filters capture dust, pollen, and allergens to improve air purity.
• Ideal for airtight or energy-rated homes, offices, and schools.
• Typically runs continuously for balanced, controlled airflow.

This baseline helps you prioritise interventions with the highest return on investment.

The HRV process is simple but highly effective, using airflow exchange and heat transfer to purify and refresh indoor air. By reclaiming energy that would otherwise be lost, it maintains comfort and air quality with minimal waste.

How it works:

• Extraction phase: Stale, moist air from bathrooms, kitchens, and living spaces is drawn out.
• Intake phase: Fresh air from outside is filtered and drawn into the system.
• Heat exchange: The outgoing warm air passes through a heat exchanger, transferring its heat to the cooler incoming air.
• Delivery: Fresh, warmed air is supplied to bedrooms and living areas through discreet ducts.
• Continuous cycle: This constant exchange ensures fresh, temperature-balanced air 24/7.

Indoor air quality directly impacts health, comfort, and productivity. In the UK, where people spend about 90% of their time indoors, poor ventilation can quickly lead to a buildup of carbon dioxide, dust, and allergens.

Common problems of poor air quality:

• Trapped humidity is encouraging mould growth.
• Dust, pollen, and airborne pollutants accumulate indoors.
• Condensation leading to structural damage or damp.
• Increased risk of respiratory irritation, fatigue, and headaches.
• Unpleasant odours are lingering due to a lack of ventilation.

An HRV doesn’t just move air; it actively improves its quality. By filtering and circulating it efficiently, it ensures healthier, cleaner indoor conditions.

Main benefits for air quality:

• Removes pollutants: Continuously replaces stale air with fresh outdoor air.
• Reduces allergens: High-efficiency filters trap pollen, dust, and microbes.
• Prevents damp: Regulates humidity, reducing mould and condensation risk.
• Lowers CO₂ levels: Ensures consistent oxygen supply, especially in sealed homes.
• Neutralises odours: Extracts kitchen smells, smoke, and VOCs effectively.

One of the major advantages of an HRV system is that it improves air quality without increasing heating costs. By recovering and recycling up to 90% of heat energy, it supports both sustainability and savings.

Energy-efficient features:

• Heat recovery: Transfers warmth from outgoing to incoming air.
• Reduced heating demand: Less need for central heating in winter.
• Lower carbon footprint: Uses less energy overall.
• Smart controls: Modern systems adjust automatically based on humidity and occupancy.
• Eco-compliance: Meets UK Building Regulations for ventilation and energy efficiency.

Placement affects performance. The HRV unit and ducting should be positioned to achieve even airflow and quiet operation.

Typical installation points:

• Loft spaces or utility rooms for residential setups.
• Ceiling voids or service risers in commercial buildings.
• Air inlets in living areas and bedrooms for fresh air delivery.
• Extract grilles in kitchens, bathrooms, and utility rooms.
• Accessible filters for easy maintenance and cleaning.

A well-maintained HRV performs more efficiently and lasts longer. Regular care keeps filters clean and airflow balanced.

Maintenance checklist:

• Replace or clean filters every 6–12 months.
• Check air intakes for debris or obstructions.
• Ensure condensate drains are clear.
• Inspect duct seals to prevent leaks.
• Have a professional service annually to calibrate sensors and fans.

• Building size and layout: Determines airflow rate and duct design.
• Energy efficiency rating: Look for high recovery efficiency (above 85%).
• Noise level: Choose low-decibel systems for comfort.
• Control options: Smart sensors and app integration for convenience.
• Professional installation: Ensure certified HVAC technicians handle setup.

A heat recovery system is not just about cleaner air; it’s an investment in health, comfort, and sustainability. Over time, it pays for itself through reduced energy bills and fewer maintenance issues from damp or mould.

Core advantages:

• Healthier living spaces year-round.
• Lower heating costs and reduced carbon emissions.
• Increased property value and building compliance.
• Better air quality for allergy and asthma sufferers.
• Continuous fresh air circulation, even with windows closed.

For UK homeowners and businesses aiming for both comfort and energy efficiency, a heat recovery ventilation system offers the best of both worlds. It keeps your indoor air fresh and healthy while preserving valuable heat energy that would otherwise be wasted. If you’re considering a mechanical ventilation system with heat recovery, contact trusted HVAC professionals like Ermen Systems for expert guidance, installation, and ongoing support.

Breathe cleaner, fresher air every day with a heat recovery ventilation system from Ermen Systems. Get in touch today to learn how a mechanical ventilation system with heat recovery can make your property healthier, more comfortable, and energy-smart.