I'm replacing my headliner asap, and wanted to add some kind of heat reflectant or insulator to hopefully lessen the "oven effect" of hot AZ sun. I am looking at products from dynomat and thermo tec right now, but am open to all suggestions. Anyone used dynomat extreme for heat, not just noise (on floor or roof)? Anyone used anything to reflect heat from roof in between headliner and roof? Anyone used thermo-guard fr by thermo tec for any applic? I've been searching old posts for about 3 hours and have found a lot of info about noise control with these type products, but not much about heat reflection or insulation. Please help. Thanks.