08423322 is referenced by 28 patents and cites 130 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
13/230610
Publication Number
8423322 (B2)
Application Date
September 12, 2011
Publication Date
April 16, 2013
Inventor
Scott Douglas Hublou
Redwood City
CA, US
John Douglas Steinberg
Millbrae
CA, US
Agent
Knobbe Martens Olson & Bear
Assignee
EcoFactor
CA, US
IPC
G01B 15/00
View Original Source