When the swiftet start staying in a new BH

Often onwer of new BH asking when the siwftlet start staying his BH!!
I think the follow few factors are the key for swiftlet start staying in a new BH.
1. BH Internal Optimum Micro & Macro Condition
- Room Temperature: 28 ْC to 30ْ C (some suggest 26 – 29)
- Relative Humidity: 75% to 85%.
2. Internal and External Sound
3. Extrance Hole (for new BH, suggest – 5’ x 10’),
4. Roving and Nesting Area with smooth flying path
5. External condition suh as any successful BH nearby, flying path, food area, ect.
6. Baby swiftlet start flying out season.

I am strongly recommend only start operating (on the external sound) the BH after confirmed the 1st factor.
Any commects?