An empty house, a strong symbol of yin, negative dark energy, while the home you stay in has appropriate furnishings , furniture decor, all this is essential for the energy of your home and office.You have it renovated in every few years, add a few touches, color paint, furniture, artefacts, paintings, to improve the energy of your home thus affecting your personal and financial life chi.
In case of investment properties and closed homes, usually left empty there is strong yin energy inside. As the doors are always kept closed there is no movement of air and sunlight and thus making the energy accumulated and stagnant. It is advisable to frequently visit the house and open doors and windows to allow fresh energy in at interval of few months at least.
Accumulate dust is one aspect but stagnant energy may harm your life in other ways. While we do not have so much faith in spirits they do dwell in closed unused environments and this energy has to be kept clean by visiting and cleaning the house regularly. Burn incense at each visit and while you keep the doors and windows open allow fresh air too circulate freely in the whole house. If possible do mop the floors with salt water and purify the place, thus opening the space for positive energy.