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3 Cheapest Ways to Improve Home’s mould issue 

It is common belief that the only way to clear dampness and mould is to turn on your heating for long hours, or to leave your windows wide open until the house is freezing. These methods can be sometimes uncomfortable, and your concern is the energy bill is going to skyrocket.

The reality of building science is much simpler: mould thrives on trapped indoor moisture. By making small, budget-friendly changes to how you manage that moisture, you can drastically improve your home’s indoor air quality without relying on your thermostat.

Before implementing any new habits, there is a crucial first step: you must clean the existing mould. Mould is a living organism. If you do not physically remove the visible mould and its spores from your walls, ceilings, or window frames, it will continue to spread, even if you improve the room's conditions. 

Wipe the slate clean using a dedicated mould remover or a simple fungicidal wash to eliminate the source.

Once the area is clean, use these three zero-cost strategies to stop moisture from building up again.

1. Ventilate While Cooking and Boiling Water

Our kitchens are one of the primary moisture generators in our homes. Every time you boil water for a cup of tea or simmer vegetables on the stove, you are pumping water directly into the air. If that steam has nowhere to go, it hits your colder external walls and condenses into water droplets—creating the perfect breeding ground for mould.

Moisture Math:

Everyday kitchen activities- like boiling water using kettle, simmering pots, can easily generate 2-3 litres of airborne water every single day.

The Fix:

You do not need to leave the house freezing all day. Simply open the kitchen window while you are cooking or boiling the kettle and leave it open for about 10 to 15 minutes afterward. This targeted ventilation extracts the concentrated burst of steam exactly when it is generated, cutting off a massive supply of moisture at the source. This is particular important when you have open kitchen which moisture easily disperse to other area of the house.

2. Take the Laundry Outside

Drying clothes on radiators or indoor airers is one of the ways to spike your home's humidity levels. When wet fabric dries inside, the water does not disappear; it evaporates and hangs in the air until it finds a cold surface to settle on.

Moisture Math:

Drying loads of washing indoors over a weekend, containing roughly 5 litres  of water,  is the equivalent of pouring a large bucket of water directly onto your living room floor and leaving it to evaporate.

The Fix:

Whenever the weather permits, air dry your clothes outside. Even on cold, overcast days, the outdoor breeze will dry your clothes without adding a single drop of moisture to your indoor air. If you absolutely must dry clothes indoors due to rain, isolate them in a small room, e.g. bathroom with the door closed and the window slightly open to vent the moisture.

3. Maximize Your Toilet's Ventilation Fan

Many homes have extractor fans installed in their toilets or bathrooms, but they are often underutilized. These fans are specifically designed to pull humid, stale air out of the building.

Moisture Math:

A typical hot shower generates around 1 litre of airborne water every single time you wash. Always run your ventilation fan while showering, but crucially, leave it running for at least 20 minutes after your shower, to ensure all the bathroom is completely dry.

The Fix:

Turn on your toilet ventilation fan and leave the door open.

While standard advice often suggests closing doors to contain moisture during a shower, an open door turns your toilet's extractor fan into a passive ventilation system for the wider house. By leaving the door open, the fan actively pulls air from your adjacent hallways, creating a gentle flow of air that draws ambient moisture out of the building.

Running this fan is highly cost-effective and helps continuously refresh the air across your floor plan without letting out the heat like an open window would. Cost-wise, if a household leaves a 20W toilet fan running for 20 minutes after a shower every single day for a year, it will cost less than £1 to annual electricity bill.