Triple glazing window unit is the next step up from double glazing. It is three panes of glass separated by two spaces of air, argon or other gas and hermitically sealed as one whole unit by expert glaziers. It has an extra pane of glass compared to double glazing and brings a higher level of benefits.
As triple glazing windows are specifically good at preventing heat loss from inside, it can generally keep the temperature inside the internal glazing higher than other units. This is good to eliminate condensation inside as the misty effect typically occurs when the moisture in the air hit a cold glass surface, usually below 5°C.