We have a midcentury modern home that came with radiant heat (also from the 50s) throughout, which is cozy and efficient, but also felt risky given the age of the system and our home. We upgraded the boiler to a super efficient model that also heats our water – so it’s both unlimited, and in the winter, nearly free (great if you have two teenagers in the house). We also replaced all the pumps for the radiant system – our basement looks like a commercial boiler room. We leveraged NYSERDA energy efficiency rebates and financing tied to the property for the boiler and water heater project. We also added cold climate mini-split heat pumps so we had AC in the summer (no ductwork given the radiant) and backup heat should the radiant fail. The house now has 8 heating zones and 5 cooling zones which really allows us to fine tune the temperature year round, although I’d love a control system to automate all that and help us switch between gas and electricity more easily based on price signals. All the lighting has been replaced with Simply Conserve LEDs (including smart ones for outside – fun scheduling and color changing options!), thermostats have been replaced with smart versions (thank you National Grid incentives), faucets and toilets have been replaced with WaterSense models during renovations, and we’ve added super efficient Niagara Conservation shower heads (again, teenagers). Appliances large and small have all been replaced with ENERGY STAR models during renovations and we try to use cold water and hang clothes to dry when possible. Added blow in insulation to the attic (that was an oddly fun project – reminiscent of grown up Build a Bear) and spray foam insulation to an old shed addition off the garage we now use as a gym (that was a less fun project – so very messy). I try to buy low water plants when choosing landscaping – we used to live in CO and had no choice, but I quickly realized it was easier to be a lazy gardener with them as well so we’ve continued that habit. ENERGY STAR air purifiers and dehumidifiers have been added to improve indoor air quality (thank you National Grid Marketplace). The most fun change, however, has been buying a cargo e-bike last spring. My son has already ridden it over a thousand miles – which means we’ve saved over two thousand miles driving him around (saving both time and fossil fuels). He has room for all his lacrosse, football, and fishing gear (the kid is busy), plus a friend. As a bonus, my husband and I take it to the farmer’s market on weekends. It’s impossible to ride that thing without a big smile on your face.