to get a damper or not?

[Pack2rule]

I have read a lot about putting a damper in the stove pipe line now that I have mine set up.
Would a damper keep the heat longer? I am not getting but 4-5 hours out of my stove.

I have a Country Health 2000 stove and need it to heat longer when I am gone during the day.
I am using seasoned hard wood.

 

[Socratic Monologue]

The manual for that stove states: "Installation of a "barometric draft stabilizer" (fireplace register) on a smoke exhaust system is prohibited. Furthermore, installation of a draft damper is not recommended. Indeed, with a controlled combustion
wood stove, the draft is regulated upon intake of the combustion air in the stove and not at the exhaust."

 

[Pack2rule]

The manual for that stove states: "Installation of a "barometric draft stabilizer" (fireplace register) on a smoke exhaust system is prohibited. Furthermore, installation of a draft damper is not recommended. Indeed, with a controlled combustion
wood stove, the draft is regulated upon intake of the combustion air in the stove and not at the exhaust."

That is what I thought but a friend was telling me otherwise. I wanted to ask the experts.