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Hello all, I am looking for advice on the following. I am in the UK and have a detached house, built in 1998. I have converted one of the upstairs bedrooms into a home cinema. The room is 4.5m x 2.5m (not as big as I wanted) with a built in cupboard and also an alcove. I will be installing a cassette blackout blind for the window. So I don't annoy the neighbours with sound leakage, I shut the window when using the room. As you can imagine, in the recent warm weather, the room gets quite warm especially with the projector blowing out hot air. I've been looking at installing a ventilation system to help maintain a constant temperature and keep the air fresh. At first I got quite excited by the idea of an MVHR system as this would help keep the room warmer in the colder months. I looked at single room MVHR systems, namely Vent-Axia and Blauberg. My budget would stretch to these. Then with some more research I realised I need a summer bypass system in order to keep me cool in the warm weather. Neither the Vent-Axia HR100R or Blauberg Ultra D105-A have a summer bypass option. I don't wish to have a wall mounted system, I have seen these types available. What I would like is just an intake and extract valve fitted within the ceiling. Does anyone know if there is such an MVHR system with summer bypass within a £250 budget? Otherwise, my plan B is to install the valves and then intake fresh air and extract stale air using ducting and inline fans. If this is my only option then is there such a thing as a filter box that I can use on the intake side of things that uses replaceable filters? I've seen that Blauberg do a CleanBox system that looks great, but is over my budget. Anything similar to that? I'm happy to DIY to a certain extent. I was thinking of using a pollen filter and housing from a car as a last resort unless someone does something for this type of situation. The other thing was the control of the inline fans. It would be good to remotely control them and to have speed control - so I can trickle vent during the winter and then go full speed in the warm weather. Is this possible with a limited budget? I have updated the extractor fans in my bathroom and en-suite and connected these via smart plugs so I can voice control their operation. I can see me doing the same for the cinema room, but this won't give me speed control. I'd welcome any thoughts and suggestions on what others have done to achieve the same goal? Thanks!