In this natural refrigerant article, I will cover the advantages and disadvantages of natural refrigerant in light commercial and residential applications. There are many natural substances in this world that can be used to help or decrease the efficiency of a heating, ventilation and air conditioning system. Some of these substances are water, air, ammonia and hydrocarbons. All of these substances are natural and come from the earth we live on. During this article I will cover the pros and cons of swamp coolers, geothermal heating and cooling units and how these natural substances can help and/or detract from the performance of your heating and cooling unit. The first application I will cover Discuss where water is used as a natural refrigerant: In a swamp cooler, with a swamp cooler there is a drum made of absorbent material which the bottom of the drum is immersed in water. A fan blows outside air through the drum as the air passes over the drum, the air temperature decreases as relative humidity is drawn from the drum to the outside air passing through the drum. Some advantages of using a swamp cooler are that they are quite cheap to build and surprisingly very efficient to operate and maintain. They are inexpensive to build and install. The only materials needed to make them are a fan, a pump, a pad (synthetic or made from wood chips), water, and a box (usually made of sheet metal), The National Association of Home Builders (NAHB). estimates that an evaporative cooler, installed, costs between $700 and $1,000, compared to several thousand dollars for a central air conditioner (Swamp). Although a swamp cooler has some benefits if you live in a humid climate where some of the moisture needs to be in the middle of paper......ants can do to help your heating and cooling system to operate much more efficiently. Although it costs more to have a system such as a geothermal system, these natural substances can make the air you breathe cleaner, make the heating and cooling system run much less, which in turn you saves money on the operation of this heating and cooling system. Works Cited « Geothermal heating and cooling | About GeoSmart Technology | Sacramento.” Geothermal heating and cooling | About GeoSmart Technology | Sacramento. Np, and Web. May 4, 2014. “Groundwater Source Heat Pump Systems (Open Loop).” » Ground water source (open loop) Heat pump systems. Np, and Web. April 29, 2014. “HowStuffWorks “Swamp Cooler Benefits”” HowStuffWorks. Np, and Web. April 29, 2014. “5 things to know about a geothermal heat pump. » The family handyman. Np, and Web. May 1 2014