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A number of factors play into this decision, and these have changed over
time - particularly for computers. In the "old" days, it was common for hard
drives to not want to "spin up". In fact, the factory cure for the old Apple
hard drives was to place the drive in the center of an office chair and spin
the chair. Similarly, with older computers with a lot of bits (CPUs and
memory) in "sockets" on the motherboard and other boards, it was common for
the heating / cooling cycles to gradually work the bits out of the sockets.
We used to open up machines and - as a routine matter - press firmly on all
the socketed bits. Today, though, neither of these are common problems.
However, what can cause failure in any electronics is corrosion. And as we
all know, corrosion is closely related to moisture - and in the atmosphere,
this correlates to relative humidity. And, again, as we all know, relative
humidity is related to temperature - meaning that air at higher temperature
can hold more moisture without condensing it, which - for electronics - is a
good thing. So. ignoring discussion about the cost of the energy consumed
(which is irrelevant if you're using electric heat since a watt is a watt,
no matter how you slice it), ignoring manufacturer's advice (which - for
computers - is generally not concerned with marine use), and ignoring issues
of power surges (you could argue this one either way), keeping electronics
"warm" would likely contribute to their longevity in a marine environment.
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