Yes, a composite door can help to make your house warmer. Composite doors are made with a solid core of insulating material, typically polyurethane foam, which provides excellent thermal insulation. This means that composite doors are highly effective at preventing heat loss and keeping your home warm.In addition to the insulating core, many composite doors also feature a weather-resistant outer skin, which helps to prevent drafts and reduce heat loss even further. This can help to improve the energy efficiency of your home and reduce your heating bills.