Ventilation: A Vital Part of Your Home’s Efficiency & Health Under ECO4 and GBIS

Hand wiping condensation from a window with a paper towel during a sunrise.

As part of the UK’s ECO4 and Great British Insulation Scheme (GBIS), improving your home’s energy efficiency goes hand-in-hand with ensuring proper ventilation. When you make your home more energy-efficient with insulation or other upgrades, ventilation becomes mandatory.

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Types of Ventilation

Hand adjusting a window air ventilation system indoors.

Person installing a bathroom vent fan on a tiled wall.

Ventilation duct system being installed under a house framework with wooden beams, showcasing a flexible hose attached to a blue device in an attic or crawl space setting.

Small, adjustable vents on windows and doors that allow a steady flow of fresh air without heat loss.

Installed in areas like kitchens and bathrooms to quickly remove moisture and odors, keeping these high-humidity spaces dry.

Systems that draw in fresh, filtered air from outside, creating a constant flow that expels stale, humid air and prevents condensation.

Why should we have a well ventilated home?

Here’s why, and why you should welcome it.

Why Ventilation is Essential in Energy-Efficient Homes

Adding insulation or upgrading your home’s efficiency is a great step toward reducing energy bills, keeping your home warmer, and lowering your carbon footprint. However, these improvements also make your home more airtight. Without proper ventilation, that airtightness can trap moisture, stale air, and harmful pollutants inside your home, leading to:

Condensation – Moisture buildup on windows and walls, leading to dampness.
Mold Growth – Increased risk of mold, which can damage your property and affect your health.
Poor Indoor Air Quality – Trapped pollutants like cooking fumes, cleaning chemicals, or dust that can cause respiratory issues.

Ventilation ensures that while your home remains energy-efficient, it also stays fresh, healthy, and free of damaging moisture.