The main differences between desiccant dehumidifier and condensation dehumidifier are:
• Moisture removal method. Desiccant dehumidifier use a desiccant material like silica gel or activated alumina to absorb water vapor from the air.And condensation dehumidifier use a condenser coil to condense water vapor into liquid water which is collected.
• Efficiency. Desiccant dehumidifiers typically remove less moisture and are less energy efficient than condensation dehumidifiers. Condensation models can extract significantly more water vapor.
• Maintenance. Desiccant dehumidifiers require periodic replacement of desiccant material to maintain effectiveness, usually every 2-5 years. Condensation dehumidifiers require more frequent cleaning of condenser coils but no desiccant replacement.
• Operating costs. Due to lower efficiency and higher maintenance costs, desiccant dehumidifiers typically cost more to operate continuously. Condensation dehumidifiers can be more affordable to run long-term.
• Noise. Desiccant dehumidifiers have no moving parts so they tend to operate very quietly. Condensation dehumidifiers have a fan and refrigerant components which can produce some noise, though models are available with noise-reducing designs.
• Upfront costs. Desiccant dehumidifiers are often lower in initial purchase price but higher over the lifetime of the unit considering maintenance and replacement costs. Condensation dehumidifiers have higher upfront costs but lower long-term spending.
• Space requirements. Desiccant dehumidifiers come in a wider range of sizes, so some compact under-sink models are available. Condensation dehumidifiers tend to be freestanding cabinets and require a slightly larger space.
• Operating temperature. Desiccant dehumidifiers can operate effectively in a wider range of temperatures, even very cold ones. Condensation dehumidifiers require a minimum temperature to efficiently condense moisture and are less effective in very warm or cold conditions.
In summary, for higher moisture removal, energy efficiency and lower costs, a condensation dehumidifier is generally a better choice. But for quiet operation, lower upfront spending or use in extreme temperatures, a desiccant dehumidifier may be preferable if efficiency is less of a priority. Either can be a good option, depending on your particular needs, priorities and application.