just welcome a good spirit into your house. it's better. if you don't know what you're doing you shouldn't do it. if you insist, shield well.
if you summon an astral being it will still be an astral being. you will be able to sense it and you'll know when it's there, but it won't destroy your house. depending on what you summon, it could hurt you, maybe break things, some can start fires, but that's it. don't think because you do a spell to summon a dragon a giant European dragon will appear, then burn your house down and fly away. granted, it may try and fly away, but it's more like a ghost, some could see and hear it, but it's not physical so it's not a solid dragon.