A method of making a nanoparticulate solar control composition comprising the steps of: providing a nanoparticle concentrate comprising a matrix material and an inorganic infrared absorbing nanoparticle, wherein the matrix material comprises plasticized poly(vinyl butyral) or acoustically modified poly(vinyl butyral) and wherein the inorganic infrared absorbing nanoparticles are present at a level of 30 wt% to 80 wt%, based on the total weight of the nanoparticle concentrate; providing an ethylene acid copolymer; and combining the nanoparticulate solar control concentrate and the ethylene acid copolymer to form the nanoparticulate solar control composition, preferably in an extrusion process; wherein the inorganic infrared absorbing nanoparticles are preferably present at a level of 30 wt% to 50 wt%, and more preferably 35 wt% to 45 wt%, based on the total weight of the nanoparticle concentrate; and wherein the inorganic infrared absorbing nanoparticles preferably comprise one or more of antimony tin oxide, indium tin oxide, or lanthanum hexaboride; and wherein the matrix material may comprise recycled material, virgin material, or both recycled material and virgin material; and wherein the nanoparticulate solar control composition preferably comprises from 0.0001 weight percent to 75 weight percent, more preferably from 0.0001 weight percent to 10 weight percent of the nanoparticle concentrate, based on the total weight of the nanoparticulate solar control composition; and wherein the nanoparticulate solar control composition preferably comprises from 99.9999 weight percent to 25 weight percent of the ethylene acid copolymer, more preferably from 99.9999 weight percent to 90 weight percent of the ethylene acid copolymer, based on the total weight of the nanoparticulate solar control composition. providing a nanoparticle concentrate comprising a matrix material and an inorganic infrared absorbing nanoparticle, wherein the matrix material comprises plasticized poly(vinyl butyral) or acoustically modified poly(vinyl butyral) and wherein the inorganic infrared absorbing nanoparticles are present at a level of 30 wt% to 80 wt%, based on the total weight of the nanoparticle concentrate; providing an ethylene acid copolymer; and combining the nanoparticulate solar control concentrate and the ethylene acid copolymer to form the nanoparticulate solar control composition, preferably in an extrusion process; wherein the inorganic infrared absorbing nanoparticles are preferably present at a level of 30 wt% to 50 wt%, and more preferably 35 wt% to 45 wt%, based on the total weight of the nanoparticle concentrate; and wherein the inorganic infrared absorbing nanoparticles preferably comprise one or more of antimony tin oxide, indium tin oxide, or lanthanum hexaboride; and wherein the matrix material may comprise recycled material, virgin material, or both recycled material and virgin material; and wherein the nanoparticulate solar control composition preferably comprises from 0.0001 weight percent to 75 weight percent, more preferably from 0.0001 weight percent to 10 weight percent of the nanoparticle concentrate, based on the total weight of the nanoparticulate solar control composition; and wherein the nanoparticulate solar control composition preferably comprises from 99.9999 weight percent to 25 weight percent of the ethylene acid copolymer, more preferably from 99.9999 weight percent to 90 weight percent of the ethylene acid copolymer, based on the total weight of the nanoparticulate solar control composition.