Are you interested in finding an energy efficient home? Let me help you understand the return on your investment - message me to learn more.
Incentives: Check out this for California. https://www.energyupgradeca.org/
Leaks: It's not so difficult. You may be able to do it by yourself!
Thermostat: I changed mine to Nest a few years ago. Nest send me how I perform in terms of energy saving once a month. Very informative. I am sure there are other thermostats do the same.
Air Conditioning: it is important to choose a right size for your home. The bigger is not always better.
LED: Price on LED bulbs are coming down nicely. It will be for sure save your money.... Hence, it's good for our earth.
Appliances: I love my instant hot water system. Yes, it's still more money compared to a conventional water heater. But in the long run, you will save money. You don't waste cold water while waiting for hot water to come. ;)