Getting Constant Cooling: Examining Heat Leakage

[SalcinNossle]

I have an object that is decently thermally insulated. I want to plot how a constant cooling power of a few watts for a few minutes is going to affect the object's temperature. I need to account for how much heat is leaking in.

Getting a constant cooling doesn't seem easy. If I instead use constant heating and then just "flip" the results, would my results be good? I.e would I see how much heat is leaking in by looking at how much is leaking out?

 

[russ_watters]

There are a number of potential confounding factors, but odds are, what you suggest will be good enough.