Les wrote:

Thanks for the reply.

I have thermostat with battery backup, but have not seen any low battery
messages. Furthermore I changed batteries each year June 1, so that cannot
be the problem.

Regarding the other 2 suggestions to check out, can a tech determine if they
are a problem if the compressor is currently working? If not, should I just
wait for house to heat up again, see that the air handler is working and
compressor is not working, and then wait for a service tech?

I think a typical tech presented with a device that appears to be
working, but which is known to experience intermittent failures,
will just start replacing the likely components. That might work,
or it might just be an expensive waste of time.

You might be better off waiting for it to fail, and exercising your
own best powers of observation (e.g. is anything buzzing? smelling
like it's burning? is there anything unusual on the thermostat's
status display? etc.)

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