The Specialists In Natural Lighting Systems. Windows--Double Glazed - Cheltenham, VIC . Service: Installation. Feature: Energy Efficient. Hours of Operation: Open Monday - Friday, Open Saturdays. Payment Method: Cash, Cheques, EFT, Mastercard, Money Order, Visa. Service Option: Free Quotes, Quotes. Style: Colonial, Contemporary, Heritage. Material: Aluminium, Timber. Assurance: Guaranteed, Standards Australia