The plan
Every room of the home is drawn with its own name and its own air temperature, and it is
painted in the colour of that temperature: cyan for cold, amber for warm. The reading in
the corner is the outside air. The arrows between the rooms are the air moving: an arrow
points the way the air travels, and the fatter and brighter it is, the more heat it
carries.
Doors, windows and outside doors
Click a door to open it, and click it again to close it. Click a window to open its own
menu: there the window is opened and closed, and there its shutter is pulled down or
lifted — a shutter is only worked while the window is closed. A door in an outside wall
behaves like a window with no glass: while it stands open the room breathes the outside
air straight in.
Extractor fans
An extractor fan is built into an outside wall. Click it to switch it on or off. While it
runs it throws the room's air outside, and outside air comes back in to replace it.
Appliances
An airco, a radiator, an electric heater and a standing ventilator each carry their own
menu: click one to open it. There the appliance is switched on or off, its target
temperature is set, an airco chooses between warm and cold air, and the bin icon takes
the appliance off the plan. Drag an appliance to move it — an airco and a radiator slide
along the walls, a heater and a ventilator stand anywhere in a room — and drag the little
handle in front of a ventilator to aim it. The "+" button in the corner adds a new
appliance.
The sun and the moon
One marker travels the full circle around the house. Between 06:00 and 21:00 it is the
sun, crossing the bottom half of the circle from east through south to west; through the
night it is the moon, crossing the top half. Drag it anywhere around the circle to set
the time of day. Where the sun stands decides which windows catch the light and how much
warmth they let in — a closed shutter keeps it out.
Time and weather
The simulated time and the time-speed slider sit together in the corner. The slider runs
the day faster; set it to zero and the clock stands still, which holds the scene for an
experiment. At zero speed every indicator still answers a change at once — only the room
temperatures wait until the speed goes up. The outside temperature slider sets the day's
average, and the switch beside it chooses between the day curve, which rides up and down
with the hours, and a steady value held all day.
Changing the map
The "Change map" button swaps the working home for its bare floor plan. While it is on,
the panel adds a room, a window, a door, an outside door or an outside ventilator, rotates
the whole house, and resets the map to the one it started from. Drag a room across the
plan to move it, taking everything in it and in its walls along; drag a window, a door or
a ventilator along the walls to move it. Click a room for its own menu — its name, its
width and height, and the bin — or click a window, a door or a ventilator for its bin.
Press "Done" to go back to the working home. A changed map is remembered by this browser.