In the dark, unused corners of the house, place holy Ganga jal. This needs to change every weekly. Placing holy water helps the inflow of positive energy. The first recommendation under free vastu tips for home would be to get a Tulsi plant and place it at the window or veranda if you have one. It will purify the air that enters your house and improve the energy levels of your abode. Always try to keep a small mandir or temple in the house. It is a place where you pray.