How to increase heat capacity of Industrial Blast Furnace?

[WaterTipper]

Right now I have mine with all Reinforced Machine Casings (which were a pain to get) and two lava blocks inside.
It's 2200K ATM, but I need 2500K to smelt tungsten dust.

So how do I increase the heat capacity?

 

[Adonis0]

Heat coils can also be used to upgrade the furnace heat capacity. Note this will only increase the heat capacity of the furnace block you're using, not all that are attached to that casing tower.

What you want is four kanthal heating coils, that will up it to 2700k, and after that to increase the heat up to 3200k use four nichrome heating coils
EDIT: Apply the heating coils by right clicking the furnace with them

This information is straight from the wiki page on the industrial blast furnace.

 

[WaterTipper]

Thanks!