The main thing I recommend is having house plants. They will filter out things in the air and will add additional oxygen which to our noises make things smell cleaner. I would also recommend cleaning more often especially your floors. We use Florida water whenever we clean our floors which lingers in in the air for days. We also leave bounce sheets under our garbage bag in our closed garbage can it captures the main source of bad odors for a house. We also use incense sticks in our bedroom which smells great. In the winter when the house gets very stinky and stale we like to set up a simmer pot. Its basically just a boiling pot filled with good smelling spices, fruits, and / or spices. It also humidifies the house which is great.