My house was built in 1981 and for some reason doesn't have any ventilation in the two upstairs bathrooms, other than windows which can be opened. I want to fit some ventilation system to reduce condensation and moisture build-up as we do get some mould appearing on the ceiling and around the windowframe. Looking into the various systems I can't work out whether to get some inline fans in the loft and out through the eaves vent, or put in a continuous DMEV system in each room. As far as I can tell, the extractor fans will be noiser when in operation, but could be fitted directly above the shower and pull out all the moisture very efficiently. What's the advantage of a DMEV system and which should I be thinking about? Looking to stay in this house for the next 10-15 years.