We’ve now eclipsed the one year mark with a smart meter at the Byrne residence, so I thought a post on my observations might be in order. While there are numerous highly-informative reports available on the APS website, there isn’t a report which will let me observe a rolling 13 month period, organized by month, with daily kWh usage and daily average temperatures reflected on it. I chose to create a worksheet using Microsoft Excel, and have included a thumbnail of the report I created from the worksheet below.
First, a couple of notes on the conventions you’ll see used in the report:
- The dates without any data are reflected with ∅, (there were five of these occurrences after the meter was installed on February 9th, 2012 – four in November 2012 and one in January 2013, but none since then).
- The temperatures shown are average daily temperatures in Fahrenheit.
- If I had to average temperatures to fill a gap, they are shown in both bold and italics, (there were three of these occurrences – one in August 2012 and two in October 2012, but none since then).
- The color key for temperatures is blue for cooler temperatures, (with the darkest blue being at, or below, 32 degrees Fahrenheit), 72 degrees Fahrenheit is represented by white, and temperatures at, or above, 90 degrees Fahrenheit are deep red.
- The color key for kWh per day is green for the lowest values, (meaning values below 10 kWh for the entire 24 hour period), yellow for values hovering around 50 kWh for the entire 24 hour period and red for values at, or above, 100 kWh for the entire 24 hour period.
Now, on to my observations:
- The report covers a 13 1/2 month period – February 2012 through March 2013. The cooler months appear to the left-hand and right-hand sides of the report, (February through April 2012 on the left and October 2012 through March 2013 on the right), with the warmer months in the center of the report, (May 2012 through September 2012).
- The spike in late March 2012 was due to the architectural tour – we kept the temperatures cooler than we otherwise would have inside the Byrne residence to make it comfortable for the hundreds of guests we had that day!
- The Lennox/Aire Flow heat pumps were installed in late April 2012, so the spike on the 21st and 22nd reflected the testing done during and immediately after installation.
- Martha wrapped up her extended stay for the landscaping project in early June 2012, so there is a drop in usage, despite increasing temperatures, because we set the thermostats to higher temperatures while we’re away.
- I returned over Labor Day, so you see an uptick in energy usage in early September 2012 for the holiday weekend while I was there.
- We confirmed we had issues with the heat pumps in mid-December 2102, and you see evidence of that on the 16th. We returned in mid-January 2013 to a cold snap, and again experienced higher usage to warm up things inside.
- February 2013 was when we installed the brand-new American Standard heat pumps, so the spike on the 20th and 21st reflected the testing done during and immediately after installation.
I plan on continuing to update my worksheet on a monthly basis, but won’t publish another post about energy usage until next spring, when I’ll have the first full year of data benefiting from both perfectly-matched American Standard heat pumps and The UNICO System® air handlers, as well as the efficiency gains realized from having installed the Nest Learning Thermostats at the Byrne residence.