Filters - Fuel, oil, etc. filters are all built to pretty good spec, especially considering name brand filters are typically outsourced to Wix, Purolator, etc. Use any reputable name brand filters with 100% confidence.

Someone apparently just listened to the latest episode of 99% Invisible. http://99percentinvisible.org/episode/sounds-natural/

How does food packaging play into your sustainability rankings? For instance, using less plastic or 100% recycled cardboard?

We have fully deployed LEDs, optimized fridge and thermostat temperatures, and done a rough pass on insulation checks; yet our energy bill is still pretty high. What “next level” steps would you recommend for advanced energy savings?