Yes, cavity insulation is definitely worth it. In an uninsulated home, approximately one-third of heat loss occurs through the walls. By properly insulating cavity walls, you can significantly reduce this heat loss, leading to notable savings on your heating bills. Effective cavity insulation not only enhances energy efficiency but also improves indoor comfort by maintaining stable temperatures throughout the year. This investment helps in reducing overall energy consumption and can contribute to lower utility costs, making it a financially and environmentally beneficial choice.