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Under spot electricity pricing the price of electricity represents actual demand and supply equilibrium conditions and consumers respond to price variations so as to achieve the best cost-service tradeoff over a given time period. Using a decision modeling approach developed for prescribing consumer response to a varying electricity price, the case of space conditioning usage is analyzed in detail and a real-time control scheme is proposed. Important classes of consumers, such as hospitals, commercial buildings and dwellings, are modeled and simulations are performed. It is found that significant savings on a daily basis can be achieved through this scheme at the price of only small fluctuations of indoor temperature around its ideal value. Consumer preference consciousness results in static and dynamic savings. The latter are by far the largest and are only enabled by a varying price of electricity. A short-sight …