The following is the Roman Rite for blessing a home. This is the technique I personally use directly after any spirit conjuration as well as any time I feel the house could benefit from a little spiritual lightening. It pretty much is good house keeping and the more often it is used, the better the results. I’d suggest using it weekly for a month before introducing more space between blessings.
God the Father almighty, we fervently implore you for the sake of this home and its occupants and possessions, that you may bless + and sanctify + them, enriching them by your kindness in every way possible. Pour out on them, Lord, heavenly dew in good measure, as well as an abundance of earthly needs. Mercifully listen to their prayers, and grant that their desires be fulfilled. At our lowly coming be pleased to bless + and sanctify + this home, as you once were pleased to bless the home of Abraham, Isaac, and Jacob. Within these walls let your angels of light preside and stand watch over those who live here; through Christ our Lord.
It is then sprinkled with holy water.