**3. Conclusions**

Research on MgO and MgO-based cementitious composites is very important nowadays when most of the CO2 emission and heat consumption is made for heating and cooling purposes in buildings. MgO-based building elements (for example, wall panels, roof decking) can effectively be used for energy harvesting in buildings and provide a comfortable temperature inside the building. This study refers to the characteristics and developments of MgO-based composites.



**Author Contributions:** Conceptualization, S.K., S.E. and R.A.G.L.; methodology, S.K., S.E.; formal analysis, S.K., S.E., R.A.G.L.; investigation, S.K.; resources, S.K., S.E. and R.A.G.L.; data curation, S.K., S.E.; writing—original draft preparation, S.K., S.E.; writing—review and editing, S.K., S.E. and R.A.G.L.; visualization, S.K., S.E. and R.A.G.L.; supervision, R.A.G.L.; project administration, S.K., S.E., R.A.G.L.; funding acquisition, R.A.G.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** The authors wish to thank CEU San Pablo University Foundation for the funds dedicated to the Project Ref. USP CEU-CP20V12 provided by CEU San Pablo University.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.

**Conflicts of Interest:** The authors declare no conflict of interest.
