Windows, draughts and other ventilation account for 30 per cent of heat lost from homes, the Energy Savings Trust (EST) has said.With another 11 per cent escaping through doors and floors, the body has made several recommendations for reducing energy loss this winter.EST noted that double glazing can be an important investment for homeowners, helping to cut heating bills by around 130 a year.The group noted that in addition to providing extra warmth, double-glazed windows can also reduce noise and condensation problems.Warm air can also escape through gaps in floors and skirting boards - a problem that can be addressed with sealant or even newspaper, it was suggested.The advice was published as part of Energy Saving Week, a drive to encourage people to cut costs and become more efficient.Meanwhile, Anna-Marie Desouza, editor at Build It, recently urged homeowners who experience a DIY disaster to not give up on improving their property.