Detailed Geothermal Analysis in Cincinnati, Ohio

by filip 19. June 2014 02:49

The following numbers are all in kWh, and for my single-family house that is about 2,000 square feet, plus basement. All heating is electric. My electric bills usually come in around the 17th to 20th of the month. In the data below, an October value is actually the usage from the second half of September to the first half of October. 

The data is current as of 11/22/2016. I'll try to update this monthly.

kWh Usage Details, Monthly

Below is a breakdown of my monthly electric usage since late 2007. The gray cells is my usage when using an inefficient air-source heat pump (probably 10 or 11 SEER). The green cells is my usage since installing a geothermal heat pump.

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2007                     1,613 4,572
2008 5,053 5,676 4,644 2,815 1,404 1,325 1,235 863 1,358 962 1,517 3,764
2009 4,700 3,495 3,170 2,724 920 836 1,354 1,347 1,497 1,410 1,788 3,119
2010 5,836 5,462 3,127 1,625 1,032 1,390 1,197 1,651 1,445 1,315 1,517 4,697
2011 6,144 5,035 3,768 2,585 1,702 1,568 1,641 1,643 1,536 1,065 1,496 2,345
2012 3,028 3,663 2,922 1,637 1,422 1,358 1,800 1,485 1,523 1,317 1,683 2,695
2013 2,870 3,515 2,544 1,800 1,100 1,179 1,381 1,256 1,836 942 1,476 3,182
2014 4,416 5,750 3,226 1,488 1,193 1,331 1,408 1,294 1,467 1,088 1,441 2,427
2015 3,071 2,674 2,659 1,617 1,190 1,297 1,491 1,509 1,526 1,203 1,227 1,836
2016 2,825 2,610 1,538 1,598 972 1,191 1,494 1,775 1,369 1,220 1,151  

kWh Usage, Monthly Average

Here is a summary of the above table. The grey cells is the average, per month, of the grey cells from the table above, and the green cells are the average, per month, of the green cells above.

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Air 4,578 4,656 3,343 2,096 1,263 1,276 1,435 1,363 1,523 1,169 1,580 3,304
Geo 2,948 2,642 2,099 1,608 1,118 1,273 1,464 1,526 1,454 1,170 1,273 2,132

In the summer months I'm obviously not really saving any (significant) money, even when compared to the 20-year old, inefficient air source heat pump. I never did use much electric (for cooling) in the summer months though.

Based on the "Monthly Average" data above, I'm saving about 6,486 kWh per year. At my current electric rate of about $0.10 per kWh (it varies slightly month-to-month), the yearly savings from upgrading to geothermal is $648.57. This translates to a 23.9% savings per year over my previous electric bills.

Tags:

Personal

Bloodforge Band

Looking for the Bloodforge band site? Click here.

About Filip Stanek

Death Note Pic I'm a developer at ACG in Cincinnati, OH. I like ASP.NET, Flash, and other web technologies, & enjoy playing chess, video games, etc.

Currently playing:

Disqus

Month List