Importance

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Abstract

Example embodiments include an apparatus and a method for monitoring and reporting on HVAC performance. In an example method, an HVAC system is monitored to detect a plurality of sample intervals during which the HVAC system is active. The plurality of sample intervals may be, for example, a plurality of heating intervals and/or a plurality of cooling intervals. An ambient temperature or other environmental parameter is monitored to determine a change over each of the sample intervals. A sample value is determined for each of the sample intervals, each sample value representing a ratio between a duration of the interval and the temperature change over the course of the respective period. Statistics of the sample values are evaluated and may be used to identify changes in HVAC performance. Analogous methods preformed for periods of HVAC inactivity may be used to detect changes in heat retention performance.

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First Claim