Awful smells with the heating equipment

I am going crazy trying to remove the burnt hair odor from our air quality. I am in a rental home and since day 1 it has odored love burnt hair when the oil furnace is on. For AC, the home has no odor. Once I change the control equipment over to heating, the hair odor comes back. If the oil furnace turns off and then back on, back comes the odory odor. I have done everything I can suppose of to remove the issue. I substituted the air filter a hundred times trying to improve the odor. I vacuumed the inside of the Heating and A/C system. I even stuck a scrub brush in the ductwork to do our own ductwork cleaning. I am now thinking I need an media air cleaner or to get a real Heating and A/C corporation to do the task. The hair and dirt must be deep in the Heating and A/C or the ductwork. A real Heating and A/C specialist with good tools could handle the task. What are the possibilities that our proprietor will Spring for something love this? I am not thinking likely since our Heating and AC does work well, it is just odory. That is why I might go the air purification route instead. An media air cleaner is not all that costly. They are made for removing odors from the house. But, odors love food, garbage and smoke are fixed by air cleaners. Can an media air cleaner repair a burnt hair odor that the Heating and A/C creates? I really hope so since I am desperate. Candles, incense and cleaning the home doesn’t do anything.

space heater