Griha Pravesh Muhurat is the date and time chosen to enter a new home for the first time, so the household begins under favourable panchang conditions. This finder scans every day in the range you give, for your city, and ranks that day's auspicious Choghadiya slots and its Abhijit Muhurta from 0 to 100. Griha Pravesh is one of the two rites here for which the finder also checks Guru and Shukra asta, and one of the six for which it reports the Panchaka state.
Present-day almanacs keep weddings and housewarmings out of these stretches, but no classical verse for the bar was located, so it is applied as practice and can be switched off. In this range: Chaturmas Sat 25 Jul - Sat 21 Nov; Kharmas (Dhanurmasa and Meena) Wed 16 Dec - Thu 14 Jan.
A Griha Pravesh date is judged on the same five limbs of the panchang as any other election, with the nakshatra and weekday sets that belong to this rite. The eleven nakshatras this finder scores as favourable for entering a home are Rohini, Mrigashira, Chitra, Anuradha, Uttara Phalguni, Uttara Ashadha, Uttara Bhadrapada, Revati, Shravana, Dhanishta and Shatabhisha, and its favourable weekdays are Monday, Wednesday, Thursday and Friday.
Each factor below moves the day's score rather than settling the date by itself, and every day in the result lists the ones that fired on it. A day that ranks high usually has the nakshatra, the tithi and the weekday agreeing, not just one of the three.
The tradition names three occasions of entering a house, and they are not equally demanding. The first entry into a newly built home is the one for which a muhurat is chosen most carefully; a re-entry after an absence or after repairs is treated more lightly.
Which of the three you are performing is a distinction the tradition makes, not a setting in this tool: the finder scores a Griha Pravesh date the same way in all three cases. What changes is how much care you take over the result, since an Apoorva entry is the one the texts treat most seriously.
The finder is a day-by-day scanner. For each date in your range it computes the panchang for your city, scores the day, then offers only the day's auspicious and neutral Choghadiya slots and its Abhijit Muhurta, which is skipped on Wednesday. A window that overlaps Rahu Kaal, Yamaganda or Gulika Kaal, or that touches a tithi-gandanta band, is capped at 40, marked avoid and dropped from the recommended list, so a housewarming cannot be scheduled inside one.
What it does not do is reason about months. Chaturmas, the two Kharmas, Adhik Maas, Pitru Paksha and Holashtak are all month-level or fortnight-level periods, and the finder has no channel for them, so days inside them can still be returned. Those remain yours to check - the almanac panel on the Panchang page names the running lunar month and whether it is adhika. Panchaka and Guru/Shukra asta are the exceptions, because both resolve on a single day, and both are computed and shown.
For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.