There are 2 main types of dehumidifiers: compressor dehumidifiers and desiccant dehumidifiers. You can learn more about the difference in our Dehumidifiers Buying Guide but, in essence, desiccant dehumidifiers are better for rooms that are below 10°c whereas compressor dehumidifiers are best in warmer, humid conditions. Compressor dehumidifiers generally have lower running costs and a higher capacity than equivalent desiccant models, but desiccant dehumidifiers are the perfect choice for conservatories, garages, boats, and caravans.