Consider replacing your roof with shingles that are lighter in color or even using white tiles. Having a lighter-colored roof will reduce the amount of heat absorbed by your attic and upper floors, making your house more comfortable and reducing the energy needed to cool it during these hot summer months.
Don't be afraid to use bright colors in the decor of your home. Paint a wall pink or red if you want to. It's only paint, you can always re-paint it later. The most important thing is letting your own personality shine through in the style of your home.
Don't waste water due to leaky faucets or plumbing. Check them regularly and have any issues addresses as soon as possible. Along those same lines, use cold water to wash all your clothes. It will reduce the strain on your hot water heater and add time to its lifespan.
When improving your house, there are some projects that you can do yourself and others that you cannot. If you feel like you can complete a simple task like repainting the kitchen, then by all means do it, in order to save yourself some extra money. Just be sure that you know what you're getting yourself into before you start a project. You don't want to try and redo your landscaping and find out half way through that you're not sure if you can complete the task without hitting an electrical line.
No matter what project you decide to start with, home improvement tasks are a way to adjust the look and feel of your property to meet your changing needs. The information above can be used as a starting point to help you plan and complete your next project.