Jain Technologies Pune, Maharashtra

A cool roof is a roofing system that delivers higher solar reflectance (the ability to reflect the visible, infrared and ultraviolet wavelengths of the sun, reducing heat transfer to the building) and higher thermal emittance (the ability to radiate absorbed, or non-reflected solar energy) than standard designed.Costs are one of the major benefits of cool roofs. Cool roofing is known to be very affordable overall, with energy savings ranging from 7%-15% of total cooling costs. Like all roofing projects, however, costs can vary depending on multiple factors: project size, project location, climate, and ease of roof access. Some projects have very low installation costs with little to no maintenance, while the associated energy savings provide a great incentive for consumers. Payback periods can be as low as six years.

A rooftop photovoltaic power station, or rooftop PV system, is a photovoltaic system that has its electricity-generating solar panels mounted on the rooftop of a residential or commercial building or structure. The various components of such a system include photovoltaic modules, mounting systems, cables, solar inverters and other electrical accessories. Rooftop mounted systems are small compared to ground-mounted photovoltaic power stations with capacities in the megawatt range. Rooftop PV systems on residential buildings typically feature a capacity of about 5 to 20 kilowatts (kW), while those mounted on commercial buildings often reach 100 kilowatts or more.