One of the great things about the Web is there’s a resource for just about everything – especially in our field of air conditioning/heating/home improvement/energy use.
A specific tool I like to tell people about is the Energy Star Home Energy Yardstick. It takes about five minutes and you need the last 12 months worth of utility bills, but it can tell you how your home stacks up in terms of energy consumption, especially regarding your San Antonio air conditioning system. Then you can use the information to determine which home improvement projects may be more important than others.
Check it out and let me know what you think.