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The other recent change I made was to install a digital programmable thermostat to replace the manual one. With these you know the exact temperature and don't have to guess based on where the little metal piece is on the temperature gauge. They are programmable so you can set the temp to change at certain times of the day. For instance, currently we have ours set to get warmer during the day when we are not home and then start cooling off around 4pm so when we get home it is cooler. You can even make it control the weekends differently because you are home and there is an override button so you can change it at any time if you want it cooler or warmer. They are pretty amazing. Anyway, they save on average $100-$150 a year which also means you are cutting your energy usage.
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Whether you think global warming is real or not, these two simple things save you money and cut energy use which means I am using less electricity which is made using fossil fuels which pollutes. Just imagine if everyone made these simple changes. Here is a good website to help you reduce energy usage and save money. http://www.energystar.gov