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An air conditioning system with a variable sensible heat ratio. The system includes a servomechanism that monitors the sensible and latent heat in the air being conditioned and adjusts the operation of the system accordingly. A microprocessor calculates the respective rates of change in sensible and

An air conditioning system with a variable sensible heat ratio. The system includes a servomechanism that monitors the sensible and latent heat in the air being conditioned and adjusts the operation of the system accordingly. A microprocessor calculates the respective rates of change in sensible and latent heat and adjusts the operation of the system so that the desired amount of sensible and latent heat is removed at the same time, thereby conserving energy. The system includes a variable speed supply air fan and a plurality of subcooling coils. Under a first set of conditions, the fan is slowed down and the subcooling of the refrigerant fluid is increased. Under a second set of conditions, the fan is sped up and the subcooling is decreased.

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An air conditioning system including a compressor means and an evaporator means, comprising: sensible heat sensing means disposed in sensing relation to return air from a space being air conditioned; latent heat sensing means disposed in sensing relation to said return air; a microprocessor means ha

An air conditioning system including a compressor means and an evaporator means, comprising: sensible heat sensing means disposed in sensing relation to return air from a space being air conditioned; latent heat sensing means disposed in sensing relation to said return air; a microprocessor means having a first input means that receives data from said sensible heat sensing means and a second input means that receives data from said latent heat sensing means; a supply air fan; a variable speed motor means disposed in driving relation to said supply air fan; said microprocessor means having a first output means conductively coupled to said variable speed motor means; a memory means being included in said microprocessor means; said sensible and latent heat sensing means being operative to periodically supply data to said memory means; a comparator means being including in said microprocessor means; said memory means and said comparator means being conductively coupled to one another; said comparator means being operative to compare incoming data from said respective sensing means and earlier data from said memory means and being further operative to periodically determine a rate of change in the difference between latent heat and sensible heat as sensed by said respective sensing means; subcooling means for reducing the temperature of refrigerant fluid circulating in said air conditioning system prior to the entry of said refrigerant fluid into an expansion valve of said air conditioning system; said subcooling means being positioned on a cool side of said evaporator means; means for varying the amount of said subcooling; said microprocessor means having a second output means conductively coupled to said means for varying the amount of said subcooling; said microprocessor means being programmed to adjust the speed of said variable speed motor means and said means for varying the amount of said subcooling in response to input data supplied by said comparator means.