Humidity Control Specialists: Dehumidification & Accelerated Drying


Call us today on: 01926 882 624

Classic Car

Classic Car Humidity Control

The condition of a classic car stored in either a domestic or commercial environment can be directly affected if the storage conditions are not ideal. To prevent corrosion of steels, a relative humidity (RH) of 50% is required and this level of humidity can be completely independent of temperature.

It is important to provide control around this point, as higher than 70% or so can lead to mould growth, and below 40% can increase the risk of drying out leather and wooden trims and veneers.

Methods of controlling RH at these levels can be achieved by 3 methods, as follows:

Heating. Simply raising the temperature of the air will reduce the RH in the air but will not alter the moisture content or dewpoint. In this manner, RH can be adjusted, but in the summer months, such an ‘adjustment’ may require heating of a building to temperatures approaching 350C. You will also run the risk of condensation forming if the building or garage is not adequately insulated.

Cooling Dehumidification. The more ‘domestic’ approach to dehumidification relies on the ability of a cold surface to condense moisture and control RH by the removal of this moisture. This works if the temperature is at a ‘comfort’ level as would be seen in a domestic environment, but leads to potentially costly running costs for additional ‘background’ heating in a commercial venture.

Desiccant (chemical) dehumidification. This method uses the absorption capability of a desiccant to take moisture out of the air AT ANY TEMPERATURE and as such operates at the most economic level for commercial ventures, and indeed for domestic garages, where there is no requirement for temperature control.

Dehum is currently protecting many £millions worth of classic cars in both commercial car stores and for private collections, even for valuable vehicles stored in ‘rising drive’ garages at client’s private dwellings. These particular garages present their own challenges, which Dehum is pleased to be able to meet.

The Dehum units we supply operate at the most efficient level and will control the RH around your collection reliably and with accurate control. For a commercial venture, this control represents an important additional benefit to potential clients, as you can advise that your premises will protect their property effectively at all times of the year and away from the influence of outside conditions.

For more information on how Dehum can help protect your car storage facility, call us on 01926 882624, or


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Classic cars under cover





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Onfab UK

We had the pleasure to work with dehum for three weeks from 20th February in 2017. dehum has my strong recommendation for anyone who is looking for a high quality and precise job in air-conditioning.


Hague Electrical Services Ltd

We have worked with dehum on a number of high profile projects over the past 8 years.  They are committed, enthusiastic and have great attention to detail…Ultimately, they consistently meet (and often exceed) the client’s requirements.



dehum have played a significant role in the development of our processes and have become a trusted partner… As individuals, they demonstrate a pride in what they deliver and integrity in how they conduct business.



To protect against corrosion of metallic parts used to make wings at the Broughton Factory, Airbus approached dehum to design and install a bespoke system, to prevent condensation forming on wing components during transportation. dehum are able to offer a range of professional services and with 21 years of experience, were able to offer Airbus a solution to this challenging problem.


Seward Refrigeration Ltd

We have always found Sorption Wheel Services dehumidifiers to be a reliable product and have used them on several projects over many years. This has been a mutually beneficial alliance upheld by dependable support staff.


Telstar Applied Containment

ATUK has worked with dehum for many years and have always found their service and products to be of exceptional standard… dehum has always used their expertise to provide a solution…


Birmingham Air Conditioning Ltd

Having worked with Simon, Mark, David and other members of the dehum team, I can say that I have seldom met a more enthusiastic, dedicated and motivated team of individuals…


Telstar Applied Containment

Our collaboration with dehum is going well and the latest products are excellent quality, the knowledge of the design team is second to none and the technical support top notch.


Bristol Museum, Galleries and Archives

dehum have provided and serviced equipment to maintain safe relative humidity levels in our museum stores and archives for more than twenty years…

David, Preventative Conservator

Clients we help

How our systems can help

Using our engineering expertise and skill base, we are able to design unique applications, based on calculated psychometrics, to achieve and maintain optimum relative humidity levels (RH%) or accelerating drying. 

We have been behind extensive improvements in productivity across a multitude of industries.

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