3.5.2

Update about/help pages

temperatures.html

@@ -97,14 +97,22 @@
     directly — which is precisely what makes it so dangerous.
   </p>
   <p>
-    You can select your vehicle type (car, MPV, SUV, motorhome, or caravan), each with its own albedo,
-    glazing area, and insulation. A <em>Windows open</em> toggle switches to a ventilated model where
-    convective loss is roughly five times higher, dramatically reducing cabin heat build-up. Wind speed
-    has almost no effect on a sealed vehicle and is only factored in when ventilation is enabled. For
-    cars, the figure represents the cabin after roughly 45–60 minutes of parking; motorhomes and caravans
-    are treated as insulated occupied living spaces, so the estimate stays closer to the real
-    living-space temperature on cool or moderate sunny days. Values above 35 °C are shown in amber
-    (dangerous for children and pets); above 45 °C in red (potentially fatal within minutes).
+    You can select your vehicle type (car, MPV, SUV, truck/HGV cab, motorhome, or caravan), each with
+    its own albedo, glazing area, and insulation. A <em>Windows open</em> toggle switches to a
+    ventilated model where convective loss is roughly five times higher, dramatically reducing cabin
+    heat build-up. For cars, the figure represents the cabin after roughly 45–60 minutes of parking;
+    motorhomes and caravans are treated as insulated occupied living spaces, so the estimate stays
+    closer to the real living-space temperature on cool or moderate sunny days. Values above 35 °C are
+    shown in amber (dangerous for children and pets); above 45 °C in red (potentially fatal within
+    minutes).
+  </p>
+  <p>
+    A <strong>road speed</strong> selector — Static, Urban (20 mph), A-road (50 mph), or Motorway
+    (70 mph) — sits alongside the ventilation toggle. Static reproduces the original stationary model;
+    higher speeds add forced airflow that scrubs heat off the bodywork, and when combined with windows
+    open, flush the cabin toward outside air much faster than a parked vehicle. Wind speed itself has
+    almost no effect on a sealed, stationary vehicle and is only meaningfully factored in through
+    ventilation or road speed.
   </p>
 
   <h2>Indoor temperature</h2>
@@ -112,9 +120,11 @@
     The <strong>Indoors</strong> column estimates the temperature inside a building with windows closed
     and no air conditioning, simulating retained warmth, window solar gain, internal gains, and thermal
     mass hour by hour. You choose your building type from a dropdown — brick, modern insulated, Victorian
-    terrace, stone cottage, timber frame, top-floor flat, or conservatory — and the physics model adjusts
-    accordingly. Each type has its own insulation level, thermal mass, retained warmth, and glazing, so a
-    stone cottage and a conservatory behave very differently on a hot day.
+    terrace, stone cottage, timber frame, top-floor flat, conservatory, or office block — and the physics
+    model adjusts accordingly. Each type has its own insulation level, thermal mass, retained warmth, and
+    glazing, so a stone cottage and a conservatory behave very differently on a hot day. Office block
+    carries a higher internal gain (people, equipment, lighting) and more glazing than a typical home,
+    reflecting a commercial building rather than a house.
   </p>
   <p>
     The model lags toward a realistic hourly target rather than repeatedly adding solar heat, so indoor
@@ -142,6 +152,19 @@
     values above 30 °C are shown in amber, above 40 °C in red.
   </p>
 
+  <h2>Pet fur and paw temperatures</h2>
+  <p>
+    The <strong>Pets</strong> profile runs two further physics estimates alongside the shade and
+    indoor models. <strong>Fur Temp</strong> estimates the surface temperature of a cat or small dog's
+    coat sitting in direct sun, calibrated for a thin/short coat rather than a heavily-insulated breed.
+    A <strong>fur colour</strong> selector (Black/Dark, Brown/Tabby, Golden/Tan, White/Pale) sets the
+    coat's albedo — darker coats absorb more solar radiation and run hotter, the same principle as
+    Shade Air but applied to fur rather than skin. <strong>Paw Temp</strong> reuses the concrete
+    surface energy-balance model above to estimate ground contact temperature, colour-coded by burn
+    risk instead of the general amber/red thresholds: green below 40 °C, amber 40–52 °C, red above
+    52 °C.
+  </p>
+
   <p>
     These columns appear together in the <a href="./profiles.html">Temps profile</a>. For what every
     column means, see the <a href="./columns.html">column reference</a>.