Clone of Simple Thermostat Example
The simplest negative feedback dynamic: a constant upper limit.  Used to explore Insightmaker options.

Note: temperature units don't work.  The simulation uses dollars to show how the relationships between units.  Removing units (making every variable unitless) is also an option.

The above note is now untrue. I changed the unites of "heating rate" to "degree/minutes" and do not now get a units error.  (Paul Newton)

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