Our standard 'C' rated windows are fitted with argon filled 28mm Planitherm total double glazed units. These have excellent insulating properties and as the name implies the glass is crystal clear.
Worth bearing in mind when replacing some windows in a house - are the existing windows K glass or not? If the new 'C' rated windows are fitted in a room along side older K glass windows you will immediately notice the difference. K glass has a slight greenish tint and does not have the clarity of the new windows. It is therefore important that each room only has one kind of window in it. The cost savings of our 'C' and 'A' rated windows means that there is really no contest. Fit the best!