When you look at homes, how much energy it takes to live there comfortably is an important factor. Square footage plays a big part in energy efficiency; the bigger the house the more energy it will take to heat and cool it. Next look at the windows, are they double-paned. Windows can be a huge source of energy loss. Look for energy star appliances. If there is more warm weather than cool weather the air ducts should be high. Likewise, in a cool climate the ductwork should be low. Also, you should not be able to feel any drafts around doors. Of course, insulation is extremely important, if the owner can document the insulation installed that will help. If insulation is the only thing lacking, you can have it installed to up the energy efficiency.
Look for Alternative Energy Sources
More and more homes feature alternative energy as the primary or 
supplemental source. In the Sunbelt states, some homes are using solar to power everything from water heaters and pool heaters to whole house energy sources. Some home owners are even able to sell energy back to the electric company. Those living off grid have learned to depend on solar and propane which is much cleaner than coal-fueled electric plants. Some really serious tree-huggers have installed the own bio-powered generators at their homes. These you would probably have to install yourself.
Make Sure that Green Landscaping is in Place
This varies so much from one climate to another. Generally speaking though, large trees near the home are great for providing shade in the summer. In the colder climates as they lose their leaves more light gets through to give more light and warmth. In the dryer parts of the country, look for homes that feature natural landscaping which use little water to maintain. Look for low water trees to increase the amount of shade. Although, older homes tend to have citrus, these trees take a lot of water to keep healthy.
Look at the Outdoor Space
Perhaps you are hoping to have your own organic garden. Make sure there is enough sunny area for your garden and compost pile. If you live in a development, check if there is an Home Owner Association that regulates what you have in your back yard. Some HOAs will not let you hang clothes in the back yard (a huge energy savings.)
I am sure that you can add to this list. Often buying an older home and renovating and recycling can be the greenest option.
By Karen Bellas See http://www.viewmurrietaproperties.com for her properties in San Diego County, CA (Source)
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