One year ago I bought a Nest thermostat. Out of the need to justify the $250 cost to my wife, I analyzed one year with and one year without the Nest. Below are my findings.
How to read this graphic:
- Compared July 2011 thru July 2012 to July 2012 thru JUly 2013
- I extracted the Kilowatt (KW) usage from each month
- I used the mean from the average high and average low from each month then took the difference. So if the mean temperature in June 2013 was 91 and in 2012 it was 90 then the difference was “1”.
- The temperature isn’t part of any equation. It’s just meant as an indicator of why the usage may have been different
- The cost difference is based on the actual cost from month to month, so “$-81.75” means I paid that much less compared to the same month in the previous year.
- The graphs speak for themselves. The values are less erratic in the Post Nest months … more predictable and less costly.
So I saved $326.58. Factor in the $250 cost, my actual one-year savings are $76.58 and every year after this will be pure savings.