Any padding will increase the carpet's effectiveness in reducing sound. Energy Carpeting can reduce heat loss through the floor. Savings may be most noticeable in extreme climates, especially if carpet is installed on an uninsulated floor over a crawl space or concrete slab. Pile density and padding are the important factors to consider here. Carpets are not a wise choice for sun-lighted spaces you wish to use for passive solar collection.
Research shows the thinnest of carpets impede solar collection in the floor heat sink.
Neutral colors show the least fading, but darker colors absorb more heat into the space. If outdoor living areas are to be carpeted, consider durability, maintenance and tolerance of weather conditions. Solution dyes tolerate sunlight better than other dyes. The fiber also must resist sunlight and heat. Outdoor carpeting must be constructed so moisture can drain away.