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Heating

Advice on boilers, radiators, central heating systems and keeping your home warm and energy efficient.

Heating

The Battle Against Condensation: What You Need to Know

It’s that time of year when temperatures go down outside, leading to condensation. Condensation and mould may be unpleasant, but they are common problems, especially in homes that have had double glazing installed. Here’s what you can do to control or prevent a build up of condensation and mould.

It’s that time of year when temperatures go down outside, leading to condensation. Condensation and mould may be unpleasant, but they are common problems, especially in homes that have had double glazing installed. Here’s what you can do to control or prevent a build up of condensation and mould.

Condensation happens when warm air meets a cold surface and the water droplets in the warmer air are converted from vapour to liquid. If this condensation is left unnoticed or unchecked, it can turn into mould, which can lead to health problems as well as structural issues in the home.

Ventilation

Ventilation is the key to preventing the build up of condensation. By letting indoor air circulate more easily around the house, you are less likely to see moisture levels rise. Extractor fans should be used in laundry rooms, kitchens and bathrooms; these remove the damp air and take it outside so that humidity in the room is reduced. It is important that windows are opened occasionally, too (even in the cold!); this allows dry air to replace the damp air in the house.

Dehumidifiers

Dehumidifiers can also be effective in reducing humidity in the home, and as a result reducing condensation. They work by taking in the air around them and condensing the water usually into a bucket or tub. Small, domestic dehumidifiers usually have receptacles for gathering water integrated into them whereas industrial dehumidifiers usually dispose of water via a hose into an external bucket (or even out of a window). Dehumidifiers vary in cost, depending on the size and quality, but they make a significant impact in terms of controlling humidity.

Insulation

Insulation plays a key role in condensation prevention. Good insulation keep surfaces warmer, so there are fewer cold surfaces to cause a build-up.

Changing a few simple habits can go a long way to reducing humidity internally. Condensation is the result of a build up of moisture, so the more you can do to prevent that moisture, the less likely you are to struggle with condensation. Make sure that you cover pans when you are cooking to prevent steam from being released (your food will cook more quickly, too!). Try not to dry clothes inside, but if you don’t have a choice, do it in the bathroom with the extractor on, near an open window, or in a smaller room with a dehumidifier.

Keep on top of condensation and mould with regular maintenance. Some condensation and mould may be unavoidable but if you clean mould regularly and wipe down any damp surfaces as often as you can, you may be able to stop serious damp and mould problems from arising.

If you live in a rented property and you are struggling to cope with mould or damp, get in touch with your landlord and see what measures they can take to support you. For more advice, follow Trust A Trader on Facebook or X.

Looking for more heating advice?

Find clear, practical answers to common heating questions, helping homeowners understand everyday issues, know what checks they can carry out safely, and when it is best to contact a qualified professional.

  • What is the difference between a combi boiler and a system boiler?

    A combi heats water straight from the mains on demand - no cylinder needed, which makes it compact and ideal for smaller homes or flats. A system boiler works with a hot water cylinder, storing a ready supply that can serve multiple taps or showers at once without the pressure dropping - better for larger homes with more bathrooms. There's also the conventional boiler, which needs both a cylinder and a cold water tank in the loft - common in older properties. A heating engineer can help you figure out which suits your home best.

  • Is an air source heat pump right for my home?

    Heat pumps pull warmth from the outside air (even when it's cold) and use it to heat your home and hot water. They work best in well-insulated homes, ideally with underfloor heating or larger radiators that work well at lower temperatures. In draughty or poorly insulated properties, the benefits are more limited. The Boiler Upgrade Scheme currently offers a grant of up to £7,500 towards installation, so it's worth getting a professional assessment to see whether your home is a good fit before committing.

  • How often should a boiler be serviced?

    Once a year, by a Gas Safe registered engineer. It keeps the boiler running safely, catches small issues before they become expensive, and is usually a condition of the manufacturer's warranty. Some home insurance policies require proof of regular servicing too. If you're not sure when yours was last done, book one before winter - better to find out before you're sitting in a cold house!

  • Why is my radiator cold at the top but warm at the bottom?

    This issue is almost always trapped air. Bleeding the radiator - using a radiator key to release the air - usually sorts it, and it's one of the few heating jobs you can safely do yourself. If bleeding it doesn't work, or if several radiators are having the same problem, it might be a pressure or pump issue. Worth getting a heating engineer in to have a look.

  • What are the signs my boiler needs replacing?

    Keep an eye out for: frequent breakdowns, energy bills going up without using more heat, unusual noises (banging, kettling, or whistling), a flame that's yellow or orange instead of blue, and any visible leaks or rust around the unit. If your boiler is over fifteen years old and ticking any of those boxes, replacing it is usually the more economical choice - modern boilers are significantly more efficient.

  • Is underfloor heating worth it and do I need a professional to install it?

    For a new build or a big renovation, underfloor heating is often a great investment - it heats rooms more evenly than radiators and can be more efficient, especially alongside a heat pump. Retrofitting in an existing home is more of a job, and how worthwhile it is depends on your floor types and how much disruption you're happy to deal with. Either way - wet or electric - it has to be installed by a qualified professional.

  • Why does my boiler keep losing pressure?

    Some pressure drop over time is normal, but if you're topping it up regularly there's usually a cause: a small leak in the system (which isn't always easy to spot), a pressure relief valve that's releasing water, or air in the system after bleeding radiators. Topping it up via the filling loop is fine as a short-term fix, but if you're doing it more than a couple of times a year, it's worth getting an engineer to look into why it keeps happening.

Have a question about TrustATrader?

If you have a question in relation to TrustATrader specifically, please check out the TrustATrader FAQs, with separate lists tailored to consumers and tradespeople. Alternatively, get in touch with our team. We're happy to help!