ADVANCED POLYCARBONATE RIGA Style:  The pinnacle of a greenhouse, hands down the best when you require performance.  The triple or double-walled 10-year poly panels insulate and diffuse light to ensure heat build-up and retention while minimizing the sun’s direct intensity.  Precisely engineered and stout aluminum framing enables these  ‘Do-it-yourself kits’ to see many years of service, with the highest tolerance of extreme weather conditions of wind, snow, and salt spray.  The insulating ability, especially of the triple-walled variety, enables the owner to consider winter heating as an option if needed.