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Temperature control in a space served by multiple HVAC equipment

  • US 7,621,140 B2
  • Filed: 09/01/2005
  • Issued: 11/24/2009
  • Est. Priority Date: 09/01/2005
  • Status: Active Grant
First Claim
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1. A method for controlling an environmental control system that services an inside space of a building, the environmental control system having a first temperature modification source and a second temperature modification source, both for modifying the temperature of the inside space of the building, the environmental control system further having a temperature set point, the method comprising:

  • disabling the second temperature modification source;

    activating the first temperature modification source;

    determining if the temperature of the inside space of the building is not reaching the temperature set point within a selected period of time, and if so;

    disabling the first temperature modification source;

    at least selectively activating the second temperature modification source;

    measuring the outside temperature; and

    determining if the outside temperature has changed by a predetermined amount, and if so;

    disabling the second temperature modification source and at least selectively activating the first temperature modification source.

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