Any window fitters/experts out there?
Had a quote this week from a window firm who I have used before. They quoted for 2 large UPVC windows at the front of the house. They said they will use the latest locks for security and the sealed units will be made using Pilkington K glass. More energy efficient they all say. However another local firm has adverts saying they will be using windows made with units which are energy 'B' rated. Now this firm say in the advert that these windows are better than any using Pilkington K glass.
Which is right? Window expert help is needed thank you.