You should never feel pressured to buy something, especially an expensive solar energy system. These types of salespeople are pretty common in this industry. You can tell them you'll be back later, and they should be fine with it. If they are persistent about making a deal now, tell them that the deal should be just as good in the future. Making decisions under pressure can be more costly later on.
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Consider your home's outside design when thinking about solar energy. Having solar-powered pathway lights installed outside is an easy way to use solar energy at home. If you're building a home, positioning it so that it can take advantage of the sun's rays is also beneficial. Well-oriented homes filter in winter sun rays in the south-facing windows and that can reduce heating bills.
Know that solar panels do not immediately mean free energy forever. You need to be mindful of the fact that solar installations often carry a large up-front price tag. However, you also need to balance that with how much energy you can save over the long run, government incentives and the possibility of selling your excess power into the grid.