Use fixtures that have more than one bulb so that if a bulb burns out, you're not fumbling in the dark. Consider a bath bench or seat and grab bars around tub. Have a telephone extension within reach of bathtub and toilet. Have a good, stable stool. Remove clutter from around stove to eliminate fire hazard, and have a smoke detector and fire extinguisher nearby.
Many seniors wear too much clothing and become overheated in summer months.
Make sure at least one room in your home is air-conditioned, and encourage seniors to drink lots of fluids. Not eating or drinking. If you're a caregiver, don't feel guilty if you don't succeed in preventing all falls. They're as good as the people on the other end of the phone. Before signing up with a company, check it out with your doctor or a hospital.