Where there's smoke, there's fire; and where there's fire, there's heat.

By changing one letter at a time to form different English words, and leaving all other letters in their original positions, convert HEAT into FIRE in the fewest steps possible. Good luck!

H E A T
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
F I R E

Here is a five-step SOLUTION.

A FIVE-STEP SOLUTION:

HEAT > HEAD > HERD > HERE > HIRE > FIRE

Did you come up with a different solution? Please post it in the comments; thanks!