Is there a device I can use or mutate such that if my front door is left
open for more than a minute an alarm will sound -
(people leave it looking shut but with a gap so loads of warm air is lost.)
((My front door is very heavy so I'm not sure a door closer would work
A reed switch and a magnet would form the basis of the detection mechanism -
especially as you can get made-for-purpose magnets and reeds.
Buzzers and 9V batteries are easy.
So that just leaves the problem of a time delay. I would use a 555 timer
chip on a bit of veroboard, but if that scares you - I'm not sure what to
suggest - maybe someone else can think of something?
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