The 3M solar film is better, and it is better to choose a solar film with good heat insulation effect, because each brand of heat insulation film will have different types and different functions. 3M solar thermal insulation film belongs to 3M building film, which has the functions of heat insulation, energy saving, glare prevention and ultraviolet blocking. Its average service life can reach more than 15 years, the product will not be deformed due to temperature changes, and its air permeability and heat insulation performance will remain unchanged during the warranty period. Reduce the entrance of solar radiation heat and pump it out without spending money. Unlike curtains and shutters, 3M classic thermal insulation film can block up to 79% of the solar radiation heat that may enter the room through windows. In other words, every 65,438+000 square feet of glass is exposed to sunlight, which can save 65,438+02,000 British thermal units per hour.