The main types of dehumidifiers include:


Refrigerant dehumidifiers. These are the most common types of dehumidifiers. They use a refrigerant cycle to remove moisture from the air.

Key features include:

› Compressor, condenser, evaporator and expansion valve – Works like an air conditioner to dehumidify.

› Usually more efficient and extract more water than other types. But more expensive.

› Come in many sizes for both whole-house and spot removal use.

Desiccant dehumidifiers. Use substances like silica gel, lithium chloride or activated alumina to absorb moisture. Features include:

› Typically lower in cost but less efficient and capacity than refrigerant types. Better for small spaces.

› Require replacement of desiccant material every few years to maintain performance.

› No compressor so they tend to be quieter, but can be more maintenance-intensive.

Condensation dehumidifiers. Use a condensing coil to convert water vapor in the air into liquid water that is collected. Key points:

› Reliance on low air temperatures prevents full efficiency. Require a cooler to operate.

› Very simple in design but also tend to be relatively high-maintenance with plugged condensing coils.

• Electrode(ionizing) dehumidifiers. Use high-voltage electrodes to convert water vapor into hydroxide ions to remove moisture. Features include:

› Little maintenance since no moving parts but higher upfront costs.

› Slower to remove large volumes of moisture so better suited to spot removal than whole-house use.

› Relies on an ionizing process so requires an air filter which adds to costs.

› Can be more energy efficient than refrigerant types with lower operational costs.

• Other factors to consider include:

› Capacity – How much moisture it can remove in square feet or pints per day. More capacity for whole-house, less for spot use.

› Energy efficiency – Lower cost to run and more eco-friendly. Look for higher AFUE or EER ratings.

› Controls – Manual on/off or automatic controls that adjust based on humidity. Automatic controls tend to be more convenient and efficient.

› Appearance – Window air conditioner style, freestanding cabinet, compact under-sink model, etc. Choose based on your needs and space.

› Noise level – Operationally quieter models available, especially important for bedrooms and home theatres. Decibel ratings can indicate noise potential.

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