전세방 or 전셋방 which word is correct?

전세방 or 전셋방 (a rented room)
전세집 or 전셋집 (a rented house)
which word is correct?

Even many Koreans use it incorrectly.

the answer is

전세방(O) / 전셋방(X)
전세집(X) / 전셋집(O)

because 방 is origin from Hanji language. (房)
but 집 is pure Korean language.
it makes difference.

Hanji + Hanji word = 전세 + 방 (a rented room) > 전세방
but Hanji + pure word = 전세 + 집 (a rented house) > 전셋집

It's very difficult 😖