The Talmud writes that one who rents a property in the Diaspora is obligated to put up mezuzot after thirty days. Many authorities argue that a bungalow is no different than any other property rented for more than thirty days.[A]Agur B’ohalaecha 31:3; Sha’arei HaMezuzah 4:9:17.
However, there are rabbis who opine that a bungalow does not lose its “temporary” designation even after thirty days, for a variety of reasons. Some assert that since the family still lives in their Brooklyn home, their sojourn in the country remains temporary throughout the summer.
Others point out that since the head of the household commonly stays in the family home during the weekdays and only joins the family for Shabbos, the bungalow is always a secondary dwelling.[B]Mishneh Halachos 4:134. See Sha’arei HaMezuzah 4:9:16.
Practically speaking, many authorities rule that one should indeed affix mezuzot on bungalows, but without a berachah.[C]Sha’arei HaMezuzah 4:9:17; Sedei Chemed, Mem:118; Minchas Yitzchak 10:92; Cf. Agur B’ohalecha 31:3:5. Rabbi Moshe Feinstein writes that one should do so after the thirty-day period has elapsed.[D]Igros Moshe Y.D. 1:179.