One of the best ways to improve your home is to make it more energy-efficient. This can be done in a number of different ways, and many of them are relatively inexpensive. One simple way to reduce your energy consumption is to install LED light bulbs. LED bulbs use less energy than traditional incandescent bulbs, and they also last much longer.
Another way to reduce your energy consumption is to insulate your home. This will help to keep heat in during the winter and cool air in during the summer, reducing your need for heating and cooling. There are a number of other ways to improve your home on a budget, so do some research and see what options are available.