This article reviews the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2018. The objective of this article is to understand the current issues in the areas of heating, cooling, ventilation, sanitation, and indoor environments of buildings and plant facilities as per the recent research. Summary of this paper is follows :BR (1) The papers published in the field of building mechanical system can be categorized into equipment for multi-residential buildings and building envelope related technology, data center and clean room related technology, renewable energy related technology, and other related technologies. The topics included the energy consumption, indoor environment analysis, energy saving measures for radiant floor heating, temperature stratification of underfloor air-conditioning system, management of electric power demand, clean room humidification, initial cost of central heating and cooling system, solar thermal storage, data center air conditioning system and its performance evaluation, and underfloor heat exchanger performance etc.BR (2) Articles in the field of building environment can be classified into indoor environment, building energy and others. The research topics included; the comfort of passenger in automobile, the roof ventilation of the arcade type market, the flush out of new apartment buildings, window energy efficiency ratings, the windows’ airtightness and opening performance, pollutant diffusion in national inpatient isolation units, shading evaluation of PV module, light-shelf with PV, hospital building energy management process, IAQ in children