Global climate changes have resulted in extremely high temperature in summer and households are using air conditioning system for longer hours, which means greater electricity consumption. Considering those amounts, greater effort was devoted to make an expert energy saving system for the building, especially in HVAC issue, without neglecting thermal comfort aspect.
Observing the opportunity of integrating wireless network sensors into the return air temperature sensing system of current air conditioner unit, an improvement of HVAC system performance, especially air conditioning system was established in this research. Experimental research with two different treatments, single-point and multi-point analysis, has been conducted to demonstrate the usability of this concept. In the future, this concept will be recognized as Distributed Environmental Sensing DES in air conditioning system (DES-A/C). Moreover, an independent program to regulate the air conditioning start-stop cycle has been made in advance.
Three major levels of compressors work which represent full capacity, half capacity, and zero-state condition have been discovered with power consumption equal to, 0.79 kW, 0.4-0.55 kW, and 0.03 kW, respectively. By means of 3oC of effective temperature difference, it has been revealed that DES-A/C could save 43% energy compared to conventional A/C. In addition, DES-A/C could maintain the PPV index in satisfaction range (-1 < PMV < +1) and PPD index no more than 27.5%.

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