Hello,

Son is not in area, so couldn't look myself.

Has a Honeywell Thermostat (about 8 years old) that controls his A/C
and heat (forced hot air).

A/C didn't work so called in a HVAC man who found that the inside
of the thermostat had "lots of wires fried and shot to oblivion".

This seemed to happen right after he put in new new batteries in the
Thermostat. Does this once a year, every year.

No expert, but was wondering.

What could possibly "fry" the inside of a Thermostat ?
Can't see how putting in new batteries would.

Some voltage spike from the A/C ?

Eight years a reasonable life for one of these things ?

New Thermostat, and all seems happy now.

Any thoughts would be appreciated.

Bob