08019567 is referenced by 168 patents and cites 101 patents.

The invention comprises systems and methods for evaluating changes in the operational efficiency of an HVAC system over time. The climate control system obtains temperature measurements from at least a first location conditioned by the climate system, and status of said HVAC system. One or more processors receives measurements of outside temperatures from at least one source other than said HVAC system and compares said temperature measurements from said first location with expected temperature measurements. The expected temperature measurements are based at least in part upon past temperature measurements.

Title
System and method for evaluating changes in the efficiency of an HVAC system
Application Number
12/211690
Publication Number
8019567 (B2)
Application Date
September 16, 2008
Publication Date
September 13, 2011
Inventor
Scott Douglas Hublou
Redwood City
CA, US
John Douglas Steinberg
Millbrae
CA, US
Agent
Knobbe Martens Olson & Bear
Assignee
EcoFactor
CA, US
IPC
G01K 1/00
G06F 15/00
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