Hi. I work in creative tech and have an engineering degree. I’m currently planning my second conversion, and am determined to have a crack at a smart system to better control condensation. There’s a very affordable system called Arduino - a small microprocessor that you can connect a wide range of sensors to, and control external kit with, based on coded bespoke algorithms. Arduino accepts 12v dc as a power supply and the box is no bigger than a fag packet so can sit just about anywhere behind panels or in cupboards and draw a very low amount of power off the leisure battery. There are temperature sensors and relative humidity sensors that cost a couple of quid. They’re really cheap - a complete system would cost no more than £20 if you shop around. First place I’m going to look is to control an extractor fan based on an RH reading, but the options are there for temp sensing too, so dew point calcs are possible. If anyone would like to join in on the journey (especially if you’re an HVAC engineer!) then please do chip in here. I’ve got a coder on staff at work who’ll help if the code gets complex. If nobody’s game I’ll still post the results here. I’m expecting to fail but learn something useful in the process for V2. Whatever the results I’d share them here along with code - I’m not looking to make a product, I’ve more of an open source approach. 
