There are a few ways to reduce your energy bill in an older home during the winter and summertime. Heating and cooling your home takes a large toll on your energy consumption, so installing smart thermostats can help you better regulate the temperature of your home through customizable heating and cooling schedules. Some utility companies even offer rebates for using these type of smart thermostats. Similarly, ensure that your windows and doors a properly weather-proofed in order to keep unconditioned air outside of your home.
A more involved solution would be to replace window-mounted air conditioners with a ductless mini-split system that has a high Seasonal Energy Efficiency Ratio (SEER) rating. This is another great way to reduce your energy bill costs, while enhancing the appearance of your home.