I live in a small suburban unit. I have a small backyard/courtyard. What are some of the things that I can do make my house green? I don't have a lot of money to spend.

I am a Green builder in Georgia. Many things you can do to make your home "greener" and use less energy. Will also make your home more comfortable and lower your utility bills.

Install low water use shower head (Home Depot). Check weather stripping around all doors and make sure there are no leaks. Install a programmable thermostat (Home Depot, Lowes) This will allow you to more efficiently heat and cool your home without wasting energy. Add extra layer of insulation in your attic area. Will reduce utility bill greatly! The list is endless. Go to these web pages...

http://www.mvhomebuilders.com/Green_Building.php

http://www.energystar.gov

There are many links on these pages to great ideas for greening your home. Lots of them are not expensive and will repay you in a short period of time.
Hope this helps.