Last updated: February 24, 2026
In modern homes, increasing attention is being given not only to energy efficiency, but also to indoor air quality. And for good reason — studies show that indoor air can be several times more polluted than outdoor air, as it accumulates moisture, CO₂, odours, volatile chemical compounds and fine particles. This is why more homeowners are choosing an MVHR system (Mechanical Ventilation with Heat Recovery), which allows homes to be ventilated continuously without losing heat.
So, what exactly is an MVHR system, why is it necessary, and why are MVHR filters and proper maintenance so important?
What Is an MVHR System?
An MVHR system is a mechanical ventilation system with heat recovery that performs three essential functions simultaneously:
- Extracts humid and polluted air from the kitchen, bedrooms, bathroom and other rooms
- Supplies fresh air into living spaces
- Recovers a large portion of heat from the outgoing air through a heat exchanger
It is important to understand that an MVHR unit is not just an air purifier. It improves air quality through continuous air exchange and filtration. Studies show that such systems can reduce exposure to fine indoor particles by as much as 56–90%, depending on the filter class and system settings.
This is precisely why MVHR filters are a critical component of the system — they capture dust, pollen and smog particles before the air enters your home.
Why Is an MVHR System Necessary?
Is Opening a Window Not Enough?
Modern houses and flats are highly airtight, meaning natural air infiltration is no longer reliable. International ventilation standards (such as ASHRAE 62.2) define minimum ventilation requirements that cannot usually be achieved by opening windows alone.
What Are the Real Benefits?
- Reduces moisture and the risk of mould, as humid air is continuously removed
- Reduces particle concentration, as filters capture dust, pollen and fine particulate matter
- Removes odours and excess CO₂, improving comfort and wellbeing
- Improves energy efficiency, as heat recovery allows ventilation without heat loss
In some cases, studies show that continuous mechanical ventilation can reduce indoor radon levels by up to 39%, further contributing to a healthier indoor environment.
How to Use an MVHR System Correctly
The most important rule is simple: an MVHR system should operate continuously, even during winter. Turning it off in cold weather is not recommended, because:
- Air exchange stops, causing moisture and CO₂ to accumulate
- Condensation and mould may develop
- Indoor comfort levels decrease
Even in very cold conditions, the MVHR system should not be switched off. Without continuous ventilation, moisture and pollutants quickly build up, and the system can no longer perform its primary function. Continuous operation ensures a stable indoor climate and allows MVHR filters to protect your air effectively.
Another critical aspect is filter maintenance. Even the most advanced system loses efficiency if MVHR filters are not replaced on time. This leads to:
- Reduced airflow
- Higher energy consumption
- Gradual deterioration of indoor air quality
An MVHR system can be one of the most important systems in your home, but its value is fully realised only when it operates as intended — with clean, efficient MVHR filters. Air quality is not something you always notice immediately, but its effects are reflected in your health, wellbeing and comfort.
This is why regular filter maintenance is not just a technical detail — it is an essential part of caring for your indoor environment.
If you want your MVHR system to operate at maximum efficiency, it is important to replace your MVHR filters regularly. Reliable, certified MVHR filters are available from “Filtru pasaulis” — a simple step that makes a real difference to the air quality in your home.
