Your Answers:
a) It is called Sunfilm for windscreen. No special names. There are brands like Garware, 3M, Lumnar, Vkool. Price starts from 2.5-3k and goes upto 15 K for some imported brands
b) It is indeed effective in reducing the amount of heat entering the car from windscreen. And hence increases the effectiveness of AC. However, it may not increase drastically, but almost upto 20% improvement from normal condition does takes place, depending on the type or quality of sunfilm used. There are different films available with 50% reduction, 70% reduction, 90% reducion etc. The higher reduction film you use, the cost increases and so does the effectiveness of AC
c) Go for transparent films, might cost you some 1-2K extra than normal dark films, but this extra money is worth wrt safety, specially in night driving.
Those who claim that they know everything do not know what they dont know.
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