Minimum and Maximum temperature for a copper wire to work?
0 K to 1358.15 K

-273.15 °C to 1085 °C 

-459.67 °F to 1984 °F

You can operate at higher temperatures if you can keep the wire-shaped puddle of molten copper where you need it, but it's usually easier to use platinum wire at that point. (2041 K, 1786 C, 3215 F) and tungsten after you can't use platinum any more (3695 K, 3422 C, 6191 F)

Insulated wires are a bit of a problem at extreme temperatures as insulation tends to melt, burn, or become brittle and crack.