When moving to a house that has a Mezuzah, is one to make a new blessing?
Some Poskim[1] rule that he is to recite a blessing over the Mezuzah.[2] He is to recite the blessing of “Ladur Babayis Zeh Sheyeish Bo Mezuzah.”[3] Other Poskim[4] rule a blessing is not to be recited.[5] Practically, one is to remove the Mezuzos and delay some time, check them, and then replace them with a blessing.[6]

If one returned home after a lengthy period of travel, is a new blessing to be recited over the Mezuzos?
Some Poskim[7] rule that he is to recite a new blessing over the Mezuzah.[8] He is to recite the blessing of “Ladur Babayis Zeh Sheyeish Bo Mezuzah.”[9] Other Poskim[10] rule a blessing is not to be recited.[11] Practically, a blessing is not recited.[12]

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[1] Initial ruling in Shut Rav Akiva Eiger 9, brought in Pischeiy Teshuvah 291/4; See similar ruling in M”A 19/1

[2] The reason: As a new Mitzvah is being fulfilled upon living in this house with a Mezuzah, even though he did not put it up. [ibid]

[3] M”A 19/1; Pischeiy Teshuvah 291/4

The reason: As to say “Likboa Mezuzah” is simply not relevant. [ibid]

[4] Birkeiy Yosef 19, brought in Shut Rav Akiva Eiger 9, brought in Pischeiy Teshuvah 291/4; Mor Uketzia 19; Kaf Hachaim 19/3 in length and in name of Poskim ibid, Mamar Mordechai; Har Tzevi 1/18; Piskeiy Teshuvos 19/2 footnote 6

[5] The reason: As the Sages only obligated a blessing to be recited at the time that one places the Mezuzah on the door. [ibid] Additionally, how can a blessing be said if one is not doing anything active in the Mitzvah. This is besides for the fact we never find anywhere such a blessing of “Ladur Babayis Sheyeish Bo Mezuzah” and in truth there is no obligation at all to live in a home for with doors that require a Mezuzah. [Kaf Hachaim ibid]

[6] Birchas Habayis 59/2; Piskeiy Teshuvos 19/2

[7] Initial ruling Shut Rav Akiva Eiger 9, brought in Pischeiy Teshuvah 291/4

[8] The reason: As the house was exempt from Mezuzah during his travels and a new Mitzvah is being fulfilled upon returning to the house, even though it was never removed. [ibid]

[9] Pischeiy Teshuvah 291/4

The reason: As to say Likboa Mezuzah is simply not relevant. [ibid]

[10] Birkeiy Yosef 19, brought in Shut Rav Akiva Eiger 9, brought in Pischeiy Teshuvah 291/4; Shut Maharshag 1/57; Piskeiy Teshuvos 19/2 footnote 7

[11] The reason: As the Sages only obligated a blessing to be recited at the time that one places the Mezuzah on the door. [ibid] Alternatively, as one’s furniture that remains in the hosue makes it retain its obligation of Mezuzah. [Maharshag ibid] Additionally, how can a blessing be said if one is not doing anything active in the Mitzvah. This is besides for the fact we never find anywhere such a blessing of “Ladur Babayis Sheyeish Bo Mezuzah” and in truth there is no obligation at all to live in a home for with doors that require a Mezuzah. [Kaf Hachaim ibid]

[12] Piskeiy Teshuvos ibid