Cellar windows often play a major role in converting cellars into living spaces. With optimum thermal insulation, it becomes just as comfortable in cellar rooms as it normally is on the upper floors. ACO Therm® 3.0 reveal windows for new buildings are aligned to current and future insulation standards, as standard or passive house versions as well as with flood-tight* and burglar-resistant versions. The flood-tight* refurbishment window (HDW-S plus) with pre-assembled sleeve is available for refurbishment and renovation work. ACO cellar windows are part of the ACO Therm® cellar protection system and correspond perfectly with the ACO light shaft and assembly panels.