Suggestion for Server Room monitoring

[Fajar Priyanto <fajarpri@xxxxxxxxxx>]

Hi all,
I have a situation like this:
Our little server room is always on. It has an air conditioning unit,
but barely enough.
So sometimes during weekend, the temperature could reach unhealthy
level, like 29 degree Celsius.
Currently, there's no personnel to monitor it 24 hours a day.
I'm thinking of using a tool to monitor the temperature, and then send
sms/email when it reaches certain threshold.
Anyone has an idea? Could be software based or hardware one.
Thank you.
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