Car Alarms: 97 Z28 Alarm, alarmtek, dash area

Question
When it get cold outside, below freezing, when I unlock the car with the FOB the alarm starts going off and pressing the unlock button will not shut it off, the car will start and the alarm stops when it does, it is very annoying, any idea of how to fix?

Answer
Please be more descriptive if possible.

"GOING OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
(doubtfull since none of the notes show this
car as having a factory alarm system)=FACTORY

Or,

is it: flashing parking lights,
an LED in the dash area, and a siren
going off?= AFTER MARKET

Let me know more on this to better
advise you on a course of action
to take.

Best Regards,

Robert Martin
CEO/ALARMTEK
CARALARMMAN.com