So you’re renting a room in a house? Who pays for the electricity? Regardless of if you’re splitting the electricity amongst the tenants or the landlord is covering the electricity, I’d argue you’re the one being inconsiderate as you’re increasing the energy use and making others pay for it.

Not sure about the legality of the external shutting of the window though. You should have gotten a copy of the lease you signed and many places require that documentation to include a description of your and your landlords rights. You could start there.

But honestly that sounds like a terrible arrangement and I’d look for a different housing situation if you can.