Candle smell is affecting the whole house-ductless HVAC or air purifier?

My roommate Sharon makes candles. Her main business is fundraisers for schools. So she makes hundreds of candles at a time and a whole range of scents. The smell in my house is horrible when she is in the school season. The conflicting scents give me a headache. I tried trapping Sharon in one room with her scents. Unfortunately I have a central heating and air system. The scents waft right into the ductwork and the HVAC system ensures that all rooms in the house get the smell. I want to block off the air duct in Sharon’s room but she begged me not to. The candle making process is a warm one and she wants air conditioning. In the winter not having any heating would kind of stink too. What she suggested is a ductless mini split for her room. The air duct could be blocked off and she would still have HVAC. The ductless mini split would provide heating and air and only affect her room. That would be a really expensive thing to do though. I am thinking more along the lines of an air purifier. I could install an air purification system that cleans the smells from the air quality as she makes the candles. It is a quarter of the cost and I think I will make my roommate pay the cost too. She is the whole reason I would need an air cleaner anyway. She is not going to like that though. She really would prefer me to buy her a ductless mini split complete with a smart thermostat.

air purifier plan