Installing solar is like many other significant home improvement investments. Your decision is based on your needs and finances. Because residential solar has become so popular, there is evidence that an installed system increases both the sales price and the appraised value of your home. Costs are near an all-time low and not expected to drop a lot in the next year, or so. If there is a solution that fits financially, waiting only delays reducing your energy expenses and seeing your home value immediately increase. This is especially true in Massachusetts where energy costs are much higher than most other regions in the country.