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3. World Air Conditioning Market Grows Thanks to Hot Spotshttps://www.bsria.co.uk/news/article/world-air-conditioning-market-grows-thanks-to-hot-spots/
4. Big Ladder Software, Engineering Reference—EnergyPlus 8.6http://bigladdersoftware.com/epx/docs/8-6/engineering-reference/variable-refrigerant-flow-heat-pumps.html#variable-refrigerant-flow-heat-pump-model-system-curve-based-model
5. Simulation and optimization of multi-split variable refrigerant flow systems