Hi. We have a conservatory and would like to remove the window that currently separates it from another room. To make it walk through we'd also have to remove three courses of brick below (no change to the lintel). I'm conscious that we could end up with an oven in the summer and a fridge in the winter and wonder whether there are any Building Regs that require us to address this. The conservatory has upvc double glazing with a number of broken sealed units which I need to replace.