3 · Home · measure

Home

The rooms you spend most of your life in. Air, water, the bedroom and the way a room is arranged are the parts of your environment you can actually check and change.

A small unbranded logger sits on an open shelf beside a linen-covered bed in diffuse daylight.
A modest bedroom with a shaded shelf for a repeatable observation. AI-generated illustration.

Where the sun comes in, and where it doesn’t

Some of the sun reaches your home directly: daylight comes in through the windows, and the bedroom is where night, light and Earth’s magnetic field meet your sleep. Air and water are here for a simpler reason. They are measurable, they change what your home feels like, and readers asked about them.

A hand opens a kitchen window overlooking a Swiss courtyard.

Air · 7 guides

Air

Ventilation, mould, purifiers and VOCs. A CO2 monitor is the best place to start.

Hands hold a blurred water report beside a glass and an open kettle.

Water · 7 guides

Water

Filters, PFAS, lead and copper, and the claims around special waters.

Rumpled linen lies beneath a closed window in a quiet bedroom.

Bedroom · 6 guides

Bedroom

Bed direction, Feng Shui and Vastu, grounding, evening light and fresh air at night.

Room design · Feng Shui & Vastu

Room design

Two old traditions for arranging the space you live in, a few specific bedroom rules, and a quiet way to try them at home.

Guides

Everything we’ve written, in reading order: the sky above you, the light that sets your clock, and the air and water at home.

Open questions at home

Some popular ideas haven’t been tested well yet. We explain them on their own terms and say plainly where the evidence stands.