In general, wouldn't burning sage just attract energies? I'd suggest casting a protection spell or perhaps a banishing spell to rid your house of it. Let me check my herbs, I'll tell you if any are good for smudging.
If it were me I'd cast a circle and use a mixture of sage and lavender to rid any negative energy from your house, and whilst burning the two I would declare that all negative energy be banished. That way anything that resides in your home that is not positive will be banished.
I hope this helps,
So, a good friend of mine has been seriously tormented by a demon for many years. I need to find a way to get rid of it asap. The biggest problem is, I haven't really done any magic before. What should I do...?