Well, avoid the Earth4Energy scams. I see there is one posted here aledray. I expose it here: Your biggest expense is heating (if you are in a northern climate) and perhaps cooling. If you are using the cheapest energy source (e.g. natural gas for heat) then your best option is to add more insulation. Consider a thermal audit using an IR gun. Without a thermal imager, you are blind. Have a look at this: for some examples. A lot of homes, even expensive ones, have shoddy insulation.Next comes domestic hot water. Low flow shower heads with a shut off valve (while soaping up) is the best value.If you still have some 1990 appliances I would dump them. They have come a long way in 19 years and even the cheapest appliance today is more efficient than the best back then. This includes your AC unit.On-demand water heaters will not save you much because the standby losses on a well insulated tank are very small.Things like CF bulbs can save you money, but only if you use them more than an hour a day. Also, in the winter, the heat a regular bulb generates isn't wasted. If you were using electric heat, the cost of running a regular light bulb would be zero in the winter. There are a lot of green products out there that aren't so great once you work out the math.If you want a comprehensive analysis, there is a detailed e-book here that works out the economic value of all the options so that your can prioritize your investments. Hope this helps.
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