In reply to  Jed Rothwell's message of Fri, 17 Nov 2023 19:26:01 -0500:
>Robin <> wrote:
>> I have an electric heater that can be controlled to within 1/10 of a
>> degree centigrade . . .
>That is remarkable. That is a laboratory grade thermostat.

I should have said precision, not accuracy. It can be done with a DS18B20, a 
microprocessor, and a relay.
Actually, the sensor is under the window, so cold air coming off the window 
will fall onto the desk, and hit the sensor.

>Get an IR camera!
>(Borrow one . . . they are expensive.) 

No, not worth the trouble.
Buy electric cars and recharge them from solar panels on your roof.

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