Method for maintaining an equilibrium of a physico-chemical parameter (P1,...,Px) of a medium, said method being implemented by a processing unit of a system for regulating said medium, said processing unit cooperating with storage means recording data related to a medium parameter (P1,...,Px), said storage means including: - a record (RP1,...,RPx) dedicated to said medium parameter (P1,...,Px) and arranged to store a current value (P1(t),...,Px(t)) of said parameter (P1,...,Px) and a nominal value (P1(t+n),...,Px(t+n)) of said parameter; said method including: - a step for reading the current value (P1(t),...,Px(t)) of said parameter (P1,...,Px); the current value Px(t) being the value of said parameter Px measured or calculated respectively by sensing means MC or by the processing unit UT; - a step for reading the nominal value (P1(t+n),...,Px(t+n)) of said parameter (P1,...,Px); the nominal value being a target or expected value describing a normal state of the medium; - a step for estimating a distance (Δ) between said nominal value (P1(t+n),...,Px(t+n)) and the current value (P1(t),...,Px(t)); - a step for triggering an action according to the value of said distance (Δ); said method being characterized in that: - the record dedicated to said medium parameter (P1,...,Px) includes a field for storing a due date (C1,...,Cx) for the current value to recover the nominal value; - said method includes: ∘ a step, prior to the step for triggering an action, for reading the value of the field for storing the due date (C1,...,Cx); ∘ the step for triggering an action according to said distance (Δ) being implemented if and only if: ▪ the value of the field for storing the due date (C1,...,Cx) consists of a predetermined value characterizing the absence of definition of the due date for the current value to recover the nominal value. - a record (RP1,...,RPx) dedicated to said medium parameter (P1,...,Px) and arranged to store a current value (P1(t),...,Px(t)) of said parameter (P1,...,Px) and a nominal value (P1(t+n),...,Px(t+n)) of said parameter; said method including: - a step for reading the current value (P1(t),...,Px(t)) of said parameter (P1,...,Px); the current value Px(t) being the value of said parameter Px measured or calculated respectively by sensing means MC or by the processing unit UT; - a step for reading the nominal value (P1(t+n),...,Px(t+n)) of said parameter (P1,...,Px); the nominal value being a target or expected value describing a normal state of the medium; - a step for estimating a distance (Δ) between said nominal value (P1(t+n),...,Px(t+n)) and the current value (P1(t),...,Px(t)); - a step for triggering an action according to the value of said distance (Δ); - a step for reading the current value (P1(t),...,Px(t)) of said parameter (P1,...,Px); the current value Px(t) being the value of said parameter Px measured or calculated respectively by sensing means MC or by the processing unit UT; - a step for reading the nominal value (P1(t+n),...,Px(t+n)) of said parameter (P1,...,Px); the nominal value being a target or expected value describing a normal state of the medium; - a step for estimating a distance (Δ) between said nominal value (P1(t+n),...,Px(t+n)) and the current value (P1(t),...,Px(t)); - a step for triggering an action according to the value of said distance (Δ); said method being characterized in that: - the record dedicated to said medium parameter (P1,...,Px) includes a field for storing a due date (C1,...,Cx) for the current value to recover the nominal value; - said method includes: ∘ a step, prior to the step for triggering an action, for reading the value of the field for storing the due date (C1,...,Cx); ∘ the step for triggering an action according to said distance (Δ) being implemented if and only if: ▪ the value of the field for storing the due date (C1,...,Cx) consists of a predetermined value characterizing the absence of definition of the due date for the current value to recover the nominal value. - the record dedicated to said medium parameter (P1,...,Px) includes a field for storing a due date (C1,...,Cx) for the current value to recover the nominal value; - said method includes: ∘ a step, prior to the step for triggering an action, for reading the value of the field for storing the due date (C1,...,Cx); ∘ the step for triggering an action according to said distance (Δ) being implemented if and only if: ▪ the value of the field for storing the due date (C1,...,Cx) consists of a predetermined value characterizing the absence of definition of the due date for the current value to recover the nominal value. ∘ a step, prior to the step for triggering an action, for reading the value of the field for storing the due date (C1,...,Cx); ∘ the step for triggering an action according to said distance (Δ) being implemented if and only if: ▪ the value of the field for storing the due date (C1,...,Cx) consists of a predetermined value characterizing the absence of definition of the due date for the current value to recover the nominal value. ▪ the value of the field for storing the due date (C1,...,Cx) consists of a predetermined value characterizing the absence of definition of the due date for the current value to recover the nominal value.