a function of the actuators trends the terms compressor t t 0 and damper t t 0 represent the average trend of the status of the compressor and the damper vs time one of the most common ways to compute this value is the use of iir infinite impulse response filters according to this solution these two quantities will be obtained with the following formulas c t and d t represent the status of the compressor and of the damper at the instant t d 0 represents damper closed d 1 represents damper open c 0 represents compressor u201c off u201d c 1 represents compressor u201c on u201d it 39 s important to remark that the specific case used to describe the invention takes in consideration an on off compressor and an on off damper the concepts and the technical solutions according to the invention can be extended to the case of u201c continues u201d actuators without limitations the parameters u03b1 and u03b2 inside the range 0 1 determine the u201c speed u201d of the filters in reaching the average value the closer the value to 1 the faster the filter which is good but this allows the filter to be too.