John wrote:
I have a simple single zone forced hot air heating system with a
mechanical thermostat. I believe it is low voltage. I have no AC.

I want to get a programable thermostat but don't understand the lingo.

No problem - it sounds like you have the most common of systems - single
stage heat only. In this case you can use any number of programmable
thermostats. For your application consider the new Honeywell RTH7400 /
7500, available at most HD/Lowes/Menards, etc.

http://content.honeywell.com/yourhom...ts/RTH7400.asp