Dehumidifiers are a fairly inefficient way to control air quality because the most effective ones are fairly expensive in terms of energy costs. If you are a homeowner then I highly recommend looking into a PIV (positive input ventilation) unit, very low running costs and very effective .The unit is installed in the loft space and pushes air into your property constantly as long as the air temperature remains below a set temperature (you don't get as many condensation and damp issues at higher temperatures). The positive pressure inside the building causes humid air to leave through any air gaps available.
I had this one installed, to replace a dehumidifier. The house was very prone to condensation and damp, having been built to run with minimal insulation and an open fire before these things were phased out. It completely eliminated condensation and mould issues, which the dehumidifier had never really kept at bay.
It's a good solution as long as the ambient temperatures in your loft space don't get ridiculously cold because the unit is low wattage and only raises the temperature of the air it introduces by a few degrees. You are essentially deliberately introducing a draft into a house which has become sealed up with modern glazing and insulation, so it's not perfect.
I had this one installed, to replace a dehumidifier. The house was very prone to condensation and damp, having been built to run with minimal insulation and an open fire before these things were phased out. It completely eliminated condensation and mould issues, which the dehumidifier had never really kept at bay.
PIV Systems: Positive Input Ventilation | EnviroVent
Discover all our PIV products if you don't want to do a full renovation and you require a whole house ventilation solution. Forget about removing walls.
www.envirovent.com
It's a good solution as long as the ambient temperatures in your loft space don't get ridiculously cold because the unit is low wattage and only raises the temperature of the air it introduces by a few degrees. You are essentially deliberately introducing a draft into a house which has become sealed up with modern glazing and insulation, so it's not perfect.