How to Choose a Dehumidifier for a Damp Home

General buying advice. Always check current specifications, prices and reviews with the retailer before you buy.

Condensation on windows and damp patches are common in UK homes, especially in winter. A dehumidifier can help, but only if it suits the room. Here is what to check before you buy.

Compressor or desiccant

Compressor models work well in warm, humid rooms and are usually more energy efficient there. Desiccant models perform better in cold spaces such as garages or unheated rooms, but they often use more energy. Think about where it will be used most of the time.

Capacity and room size

Dehumidifier capacity is usually quoted in litres of water removed per day under test conditions. Real-world results are often lower, so choose a model with some headroom for the size of room or home you want to dry. Check the manufacturer's room size guidance.

Tank size and drainage

A larger tank means less emptying. Some models also have a continuous drain option, so water runs through a hose to a sink or drain. This is handy if you want to leave it running in a utility room or loft.

Humidistat and controls

A built-in humidistat lets you set a target humidity and switches the unit on and off automatically. Many people aim for roughly 40 to 60 per cent indoor humidity. A laundry setting can help when drying clothes indoors.

Noise and running costs

Dehumidifiers are not silent, so check noise levels if it will be used in a bedroom or living room. Look at the power rating and use a timer or humidistat so it is not running all day for no reason.

Cleaning and maintenance

Empty the tank regularly, wash it, and clean the filter as the manual advises. A dirty filter reduces performance and can smell.