There are still some properties here in the UK that have single glazing windows and unfortunately, the people who own these properties experience a number of problems with their windows. Due to the fact that these windows only contain a single pane of glass, not only are they known for having poor insulation and causing draughts throughout the home, but they are also a security issue and much easier to break too. It is no surprise that many who have single glazed windows will search for a way that they can upgrade these and homeowners will often be presented with two different options; secondary glazing and double glazing. Whilst it can be easy to assume that these two types of windows are the same and even though their name is similar, they are actually very different. So, to help any homeowners who are wanting to upgrade their windows, below is everything you need to know about these two types of windows.