Top-quality bathroom fans and a central vacuum system both protect indoor air quality. There's also a whole-house air cleaner, which removes 99.98 percent of airborne dust, soot, and mold. Hot water for the bathroom and the rest of the house is supplied through an on-demand water heater, so energy isn't wasted by constantly heating a tank of water when it isn't needed.
Bathroom fans and central vacuum from Broan-NuTone
; air filter and HVAC by Trane