New posts

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  Indoor Humidity in Winter: Why It Drops to 20–30 RH and How to Control It (Heat Exchanger Comparison + Practical Solutions)

  date_range 18 January 2026

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  In winter, outdoor air becomes very dry once it is heated indoors, and mechanical ventilation often reduces indoor relative humidity to 20–30 RH or even lower. This article explains why this happens, how different heat exchanger types (plate, condensation rotor, enthalpy, sorption) affect indoor moisture balance, and what you can do in practice. We cover smart ventilation control during cold nights, protection against excessive drying, when a humidifier is really needed, and simple ways to increase or reduce humidity naturally. You will also find an FAQ with common real-life situations and climate-specific recommendations for different countries.

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  Why Your Heat Recovery Ventilation (HRV) Can Freeze in Winter — and How Frost Protection Works

  date_range 07 January 2026

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  Cold outdoor air and warm, humid extract air can create condensation that may freeze inside the heat exchanger. Learn what “defrost” does, why airflow balance matters, and how to reduce frequent frost cycles.

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  What Kind of Filter Should You Use in a Ventilation Unit to Protect Your Family? Safety & Health Explained

  date_range 18 November 2025

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  Not all ventilation unit filters are the same. Some ensure clean, healthy indoor air, while cheaper or uncertified filters can pose risks to both the ventilation system and your health. This guide explains what to look for when choosing filters — from ISO 16890 testing and hygiene standards to material safety and real filtration performance — so you can be confident you’re using a safe, certified and reliable filter.

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