Free room-first decision tool
Compressor or desiccant dehumidifier?
Start with the room and the job—not a technology slogan. Then compare the electricity cost of two real candidates using your own figures.
Starting tariff: 26.32p/kWh. GB average, Direct Debit, 1 October–31 December 2026. Use your billed rate, not this example; the cap does not cover Northern Ireland. Standing charge is excluded and no extra VAT is added. Currency selection changes the display, not the exchange rate or local tariff. Ofgem source ↗ · tariff checked 7 October 2026.
Step 1 · Describe the real room
Choose the coldest normal condition and the main job. No answer is sent to us.
Investigate first
Start with a compressor shortlist
Your room and use pattern point towards a compressor model as the first category to compare. This is a screening result, not a product verdict.
- A normally heated room makes a compressor model the practical first category to investigate.
- Either technology can dry laundry; compare energy for the same finished load, not cost per hour.
Your provisional electricity comparison
The category result and cost result answer different questions. A lower arithmetic estimate does not prove that candidate can reach the same humidity or drying outcome. Measure complete comparable sessions where possible.
How to use the answer
The shortlist is a starting point, not a universal winner.
Compressor machines depend on a refrigeration process, while desiccant machines use a moisture-absorbing material and regeneration heat. Their behaviour changes with room temperature, controls and the complete appliance design.
The selector uses a transparent room-first heuristic. It does not estimate litres collected, diagnose damp, or claim that every model in one category beats every model in the other. Check the exact manual and compare independent results at conditions resembling your home.
Common questions
Before you choose a category
Is a compressor or desiccant dehumidifier better?
Neither technology is always better. A compressor model is often the first category to investigate in a normally heated home, while a desiccant model can make more sense in a consistently cold space. Compare the operating range and energy needed for the same result.
Which type is cheaper to run?
Rated wattage alone cannot answer this. Multiply power, active time and your unit rate, then compare complete sessions that reach the same humidity target or dry the same load.
Which type should I use for a cold garage?
A desiccant model is usually worth investigating first for a consistently cold garage or outbuilding, but check the exact operating range, electrical safety, drainage and manufacturer instructions for that location.
Does this selector recommend a particular product?
No. It screens technology categories and compares user-entered electricity estimates. Any retailer links are specification-led candidates to investigate, not tested winners or personalised recommendations.
Evidence boundary
Sources and next checks
Use the selector alongside the exact model manual and comparable test conditions. Persistent damp, leaks, recurring water staining, extensive mould or health concerns need appropriate professional help.