For cheaper solutions, try installing a digital thermostat. Digital thermostats are programmable and can be controlled remotely by apps through Wi-Fi. Using a digital thermostat will help reduce your AC and heater usage during the times there is no one home. Additionally, thermostats can be turned off remotely during extended absences to save money. If you need to update your heating and cooling equipment, installing new equipment can drastically lower bills. New gas furnaces can reach efficiencies of 98% and heat pumps can be up to 300% efficient. The cost savings will help offset the cost of installation. Also, high-efficiency units are usually eligible for rebates.