Geez Bruce
I can see your refrigerator now. All you have in it is tippet material, soy milk, dried up moldy bananas and that crappy port you drink.
I wouldnt worry about tippet material going bad, You dont catch any fish anyways.

I think the whole thing about tippet material going bad was a conspiracy started by some fly shop owner to get people to buy more stuff. Having worked in a fly shop I know that some of the stuff sits on the pegs for more than a year before it gets sold. I wonder how long the company sat on it before they shipped it to them.
Unless it gets over 100 degrees in your house for a prolonged period of time i wouldnt worry about it being damaged by heat.