They bulbs have special darkness sensors in it which sense the darkness and turn on automatically. You have no need to turn on these solar energy bulbs manually. If there is a light then these bulbs are turn off automatically. The use of solar energy bulb is very easy. Just purchase the solar energy bulb from the market, installed it on your required place and use it. The safest and most economical way of energy conservation. Now the engineers have produced new designs of windmills that optimally utilize the blowing wind and are powerful enough to support a full household unit. Yet you can install smaller versions of windmills near your house and can store energy of electrical devices. This may be due to additional or worthless usage of electric appliances. Generally, an American family would consume about $1500-$2000 on power bills. If your bill in not in between these figures then you will be considered as a regular householder, which utilizes electricity unnecessarily. The reason is that are not required to spend to the extent of $2000 a year for energy. Use roof cavity that is connected with the walls or roof top of mobile homes. It makes your home cool and also reduces the consumption of energy. Use of air conditioning system during hot season affects your electric bill a lot. So you need air condition system which has lower energy consumption but has good results. By using small electric burners when cooking gives us better savings than large burners. It also keeps our heating system less stressful and helps in maintaining the temperature of the house. Next, lower down the thermostat of your refrigerator as well. Using a fireplace to warm up the house is quite cheaper than using the heating systems. Choice of material during house construction will help you a lot in making your house energy efficient. The reason behind is that building materials notably affect the cost of cooling as well as heating. You can easily maintain a comfy temperature level in your house just by selecting materials wisely.