Compressor vs desiccant dehumidifiers
The two main types work differently, and that decides where each performs well and what it costs to run.
| Compressor | Desiccant | |
|---|---|---|
| How it works | Cools air so moisture condenses | A moisture-absorbing wheel, which is heated to release the water |
| Best in | Warmer, heated rooms | Cold spaces such as garages and unheated rooms |
| Running cost | Generally lower | Generally higher |
| Noise | Varies by model | Varies by model |
Temperature
Ideal Home's testing notes that compressor models work from about 3 to 5°C up to 35°C, and do best above about 15°C. Below that, desiccant models are the usual choice. Hybrid units combine both approaches.
Cost
Ideal Home estimates desiccant models at roughly 9 to 17p an hour at 30p/kWh, against about 3 to 5p for efficient compressor models. Our own figures use the current price cap rate and each unit's listed power, so they will differ. Use the running cost calculator.
Our rule
- Heated room: compressor or hybrid.
- Partly heated: compressor, desiccant or hybrid.
- Cold: desiccant or hybrid.
Source: Ideal Home dehumidifier testing and guidance.