It came to my attention when remodeling a bathroom that the insulation in the attic was insufficient, to say the least.  Dolphin Insulation (Littleton MA) came up with a great solution for the house, which includes a section with an attic but also a section with cathedral ceiling.   They clearly care about doing the job right, and are as focused on energy efficiency as I am!

The house was so well sealed that it became clear that the windows were in need of replacement.  Dolphin introduced me to Intus Windows, triple-pane windows manufactured in Europe.  They are beautiful and, of course, extremely energy efficient.

We added a full solar panel installation to our home in early 2020, after vetting and reviewing several vendors and quotes during the previous six months. New England Clean Energy out of Hudson, MA won our business and did a superb job with installation and with getting the paperwork filed with the state and electric company for our admittedly oversized installation. We chose to oversize the installation to make full use of our roof area and feed back the excess to the grid for credits, refunds, and rebates. Most Spring/Summer/Fall months we generate credits with the electric company, which we then use up over the Winter months when the panels are frequently snow-covered. Our ROI is under a dozen years and the few problems encountered early on were quickly and professionally handled by NECE. If you have a decent sunny space on your roof or land, we highly recommend the investment in solar technology.

When upgrading our kitchen appliances in 2013 my gourmet cook spouse really wanted to move from an electric stovetop (older Jennaire) to a gas (propane) cooktop. Nervous about piping propane into the house, I suggested we look into an induction cooktop (consumer versions were still a new idea then). Despite having to replace over half our pots and pans, we love love love our Thermador Freedom Induction cooktop. It heats as quickly as gas and provides the same control - turning heat up or down reacts as quickly as gas. And we don't have to worry about gas leaks or burners being left on or the dangers of residual heat from a older-style electric burner. We highly recommend considering this upgrade to a stove or stovetop when installing or remodeling a kitchen.

Switched all fluorescent bulbs to LED at my home.

Backyard composting was second hand to me. Growing up in Billerica, we always had a compost pile thanks to my mom. She grew up in England and it was part of her family tradition to reuse and recycle in order to save money for a large family. Establishing environmentally friendly traditions makes it easier for the next generation to continue those traditions, allowing one to build on another.

Well I guess one could say I'm into this: 

Installed 12kw of solar electricity in 2009 & 2011 (haven't had an electric bill charge in several years)

Bought an EV in 2013 (Volt) and 2021 (Polestar) mostly charge them off solar production 

Installed geothermal heating/cooling in 2018.  Runs off solar production. Desuperheating tank preheats domestic hot water.

House converted to LED light (Yay gallium nitride!) and MassSave helped insulate the heck out of the attic to qualify for geothermal subsidy.

Been an avid fireplace insert user (firewood is generally considered carbon neutral) and it was usually our primary heat source before geothermal installed.

Composting, errand consolidation and other random minor adjustments have been generally followed to minimize our impact on the planet.