TECHNOLOGIES

How to control humidity in garages

Why is humidity a factor?

Above 70% relative humidity, mould can start to grow on surfaces. Above 60% relative humidity, the speed at which rust can form and grow increases rapidly.

Solution by ventilation

Adding more ventilation to a garage space may assist with drying a car put away wet, but with the average humidity in London around 80%, this will never prevent mould or rust.

Solution by heating

Heating will increase the amount of moisture that the air can hold and lower the %RH. This will not stop a cold car getting condensation on it, and heating is by far the most inefficient and expensive way to lower the humidity and you will not want to heat a garage when it is already warm outside.

Solution by dehumidification

Using a dehumidifier physically removes the moisture held in the air and lowers the %RH. Removing the moisture uses much less energy compared to heating (around 2.5 times less) to lower the %RH.

Dehumidification: Desiccant vs. Refrigerant

There are two main types of dehumidifier Desiccant (that uses a silica coated wheel to absorb moisture and an electric heater to dry it) or Refrigerant (that uses a compressor based heat pump to cool a surface that the incoming air passes over and the moisture condenses onto, before being reheated). Desiccant units are ideal for very low temperature (below 5°C) and/or very low humidity environments (below 40%RH) and their performance does not vary that much in usual garage conditions. However they use quite a lot of energy compared to the amount of extraction they offer. Refrigerant dehumidifiers are optimised for UK conditions, so will operate down to 0°C and will use less energy than the equivalent capacity desiccant unit. You will also get the benefit of the unit giving out 2.5 times the energy input as free heat to the garage.

Associated products

Dehumidification, wall mounted compact dehumidifier OTW15

DH 15

The DH 15 wall mounted dehumidifier has a compact design for installation in small areas,… ...read more

Wall-hung DH30/60

DH 30

The DH 30 is a high performance, low cost wall mounted dehumidifier with integrated air… ...read more

DH 60

The DH 60 is a high performance, low cost wall mounted dehumidifier with integrated air… ...read more

CDF 40

Dantherm’s CDF range of powerful dehumidifiers CDF 40-50-70 provides the ideal means of… ...read more

CDF 50

Dantherm’s CDF range of powerful dehumidifiers CDF 40-50-70 provides the ideal means of… ...read more

CDF 70

Dantherm’s CDF range of powerful dehumidifiers CDF 40-50-70 provides the ideal means of… ...read more

More information

Humidity control solution for car storage

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Contact (UK)

Jeremy Neale

Jeremy Neale

Commercial Dehumidification
Direct: +44 (0)1621 878 534
Mobile: +44 (0)7432 744 722
Contact Jeremy


Contact (International)

+44 (0)1621 856 611
International Enquiries


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