Tried to search and didn't find a definite answer...I have to run 6ft of HDMI cable down a wall in my garage that gets cold (30F) in the winter...will this affect performance of the cable since the ends will be warm being plugged into my TV and reciever inside the house...thanks to any replies.

Doubt it, it's copper on the inside...

also, i have to run my tv power cord along with an extension cord next to the HDMI cable, just wondering if that will affect that in any way also

thanks

Check with support via e-mail at one of the cable suppliers that support this forum. They may suggest that you get their cable with best shiedling in order to prevent any 60 cycle hum from the two power lines or that you use a single well shielded and grounded extension cord instead.

HDMI carries a differential signal, any induced noise is cancelled out by the differential receivers.
You cannot prevent the dynamic magnetic field around a conductor from 'leaking out' wiht an electrostatic shield. Shielded power cords are snake oil.
There are many conductors run outdoor that are exposed to temperature extremes, your cable will be fine.

I wouldn't expect any problems with the HDMI.
When you said power, did you mean permanent power wire (e.g. Romex terminated to junction boxes at both ends) or just a regular extension cord? It's generally not recommended to run extension cords inside a wall.

Re-read your post and saw that you said TV power cord and extension cord. So not permament building wiring, but cords. I'd try to find a way to eliminate running the TV power cord and extension cord inside the wall.