Henslow’s Sign in

See your home’s carbon, hour by hour.

Henslow’s turns the data your house already produces, from solar panels and batteries to gas and water meters, into a live picture of its CO2 emissions, so you can see which changes actually make a difference.

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What it tracks

Electricity
Live readings from home solar and battery systems, matched to how clean the power grid is at that moment.
Natural gas
Furnace, stove and other gas use, estimated from your utility bills.
Water
Your usage history today, with live readings once a smart water monitor is connected.
Heating and cooling Coming soon
Heat pump and furnace runtime from your thermostat, so you can see when the system switches to gas.
Electric cars Coming soon
Charging at home and on the road, counted once and matched to the local grid.

Why Henslow’s

John Stevens Henslow was the Cambridge botanist who taught a young Charles Darwin to look closely at the natural world, and who recommended him for the voyage of the Beagle.

The Henslow’s sparrow, a small grassland bird named in his honour, sits on our logo. Henslow’s is built on the same habit he taught: pay close attention, then act on what you see.