Use room size, temperature and humidity to calculate the correct dehumidifier output in litres per day. No guesswork, no undersized junk, no energy-wasting monsters.
Size My DehumidifierDehumidifiers only manage moisture in the air. They do not fix leaking masonry, failed render, high ground levels, or condensation driven by cold surfaces.
If you’re emptying the tank every day and the problem never goes away, there’s usually a building defect behind it.
Book a Damp SurveyEnter your room details to calculate the ideal dehumidifier capacity
Learn why correct sizing matters and how capacity affects performance.
Proper sizing considers: Room volume × Humidity level × Temperature × Air changes × Usage factors. Undersized units run constantly, oversized units waste energy.
Compressor dehumidifiers lose efficiency below 18°C. Desiccant models work better in cooler spaces (5-20°C). Always consider your room's average temperature.
Correctly sized units use 30-50% less energy. Look for A++ energy ratings. A 20L/day unit running 8 hours often costs less than a 10L/day unit running 20 hours.
Dehumidifiers treat symptoms, not causes. If you have persistent damp or mould, the underlying issue needs proper diagnosis. Our surveys identify whether you have rising damp, penetrating damp, condensation, or other issues.
Identify exact damp patterns and sources
Detect cold spots and thermal bridges
Tailored recommendations for your property
Our surveys determine whether a dehumidifier is the right solution or if other damp-proofing measures are needed.
Our experienced damp specialists provide comprehensive surveys to accurately diagnose moisture issues. Get a detailed report with actionable solutions tailored to your property.