No question is silly when you are learning. Don't worry, it's a good question. But 雲小泉 has the point also: sometimes things "just are" in languages. It isn't math. Still, I think there is a reason: "home" isn't a place. It's a concept. It's somewhere where you "feel at home". "A house" is a building, but "a home" is that special place of belonging for each of us.

@Sumin: Here is what one famous scholar says: 1. "Home" is now the only word that we use without a preposition after a verb of MOTION: a. He went home. b. I was home by six [o'clock]. [The idea of motion is implied in that sentence.] ***** If there is no motion, you should use a preposition: Jane was at home. [But many native speakers leave out the "at."] Reference: Volume II (page 145) of A GRAMMAR OF THE ENGLISH LANGUAGE (1931) by Professor George Oliver Curme.

Because it is the home 0.0

Home=is used in the general sense, whereas House=is more specific I'm going home now I'm walking to my house

No why! You just can't. It's silly to ask!