Journal of Intelligent Computing Zoran Marinov, Aleksandar Markoski 12 2 2021 https://doi.org/10.6025/jic/2021/12/2/61-66 https://www.dline.info/jic/fulltext/v12n2/jicv12n2_3.pdf There are many research activities carried out to enhance the energy efficiency of the buildings. We have used the wireless sensor network to develop a low cost and low powered network to ensure energy efficiency. The proposed wireless sensor network takes the low energy Bluetooth technology for linking sensor nodes that used the simple link sensor tags. The performance tests have been carried out to estimate how the wireless network sensors can ensure the temperature in different places of the buildings.