click legend labels to toggle data sets on or off

This is a scatterplot of therms used vs. heating degree days for several heating seasons, with linear regression lines added.

A smaller slope should indicate greater efficiency.

For more information about this kind of benchmarking and potential pitfalls, see Degree Days - Handle with Care! from energylens.com

Upgrades / changes:

• 2001 - Bought house, installed 82 AFUE boiler
• Feb 2005 - New double-pane windows
• Nov 2006 - Attic insulation and sealing
• Feb 2010 - Wall insulation retrofit, more attic work
• Mar 2011 - New heating zone in basement
• Oct 2013 - New renovation; 600 ft^2 added, new insulation, 1 new zone
• Nov 2014 - New 95 AFUE mod/con boiler with outdoor reset and indirect DHW