I would suggest the following:
1. Contact your utility and ask for a review of your usage. They will explain degree days and help you understand how you are using energy. Remember to compare usage not dollars - and they should help you do this. This will help you understand how you can make changes in your activities. For example, does your utility use time of day (time of use) billing? If so and you are running something like a washing machine / dryer / dishwasher during peak times, then you will pay extra to use the electricity during those times of the day; but if you change when you do those things, you can save money.
2. Contact your utility and ask for an energy audit. Some utilities do them for free, some for a small fee and some are expensive. Ask and find out. Some will rebate your money if you implement some of their recommendations - or they will even provide you with a do it yourself kit so you can hit the 'low hanging fruit' first (easiest, least expensive, rapid results). Be careful who you hire if you hire from a list... yes, there are certified auditors but you will want to ask some questions first and check their fees. Confirm they have been reviewed and are recommended by your utility.
- OR -
Conduct your own home energy audit. Your utility should have a checklist to do your own. If not, let me know and I'll see what I can find for you to use. (I work at an electric utility.)
3. After you do an audit or self-review, see what incentives are offered by your utility company and/or tax credits from your state, federal government or your local municipality for any improvements you are considering making to your home. Right now energy efficiency is the buzzword, so there are lots of incentives available.
4. Before installing anything, check with your utility first to see if there are additional installation fees, special wiring needed, meter change-out, etc.
5. Remember that a salesperson for a product is just that - a salesperson. Sales people will tell you whatever you want or need to hear to get you to buy. Do your own research. Utilities in our area offer help with sizing ground source heat pumps, provide comparisons of similar homes using products similar to or the same as you may be considering, provide you with information on degree days and your usage history, and can also answer questions about what may be driving your increased usage, etc. Sometimes we forget about things like heaters for swimming pools or stock tanks, the old refrigerator in the garage that's either empty or cooling beer, etc.
Where I live solar and wind things just aren't there in terms of reliable performance. It's not windy enough to provide sustained power at a sufficient speed to make residential wind work, and the sun isn't out enough to provide sustained power. Technology is improving but it will be some time before it becomes mainstream in *most* areas. This is why I asked where you lived because recommending a solar water heater, for example, to someone in an area where it doesn't work as well would not have been much help and might have encouraged you to part with cash you could have used better in another fashion for your climate, home and lifestyle.
Let me know if you have any questions! I'll do my best to answer them.