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An air duct system may employ an HVAC case having an exit air duct and a return air duct, a windshield with an interior surface, an approximately vertical duct, and a horizontal duct. Ducts mount to the windshield and each define an interior passageway with the interior surface of the windshield and

An air duct system may employ an HVAC case having an exit air duct and a return air duct, a windshield with an interior surface, an approximately vertical duct, and a horizontal duct. Ducts mount to the windshield and each define an interior passageway with the interior surface of the windshield and a second, return air, passageway. The interior passageway may receive air from the exit air duct and the second passageway may return air to the return air duct. End chambers of each duct reverse air direction 180 degrees. Air of each interior passageway may warm an adjacent area of the windshield that forms part of each interior passageway and a windshield wiper. The first air duct interior passageway may warm a windshield area coincident with a maximum non-park wiper position and the second air duct interior passageway may warm a windshield area coincident with a wiper park position.

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1. An apparatus comprising: an HVAC case having an exit air duct and a return air duct;a windshield having an interior surface; andan approximately vertical duct comprising: a first approximately vertical wall arranged next to the windshield and defining an approximately vertical interior passageway

1. An apparatus comprising: an HVAC case having an exit air duct and a return air duct;a windshield having an interior surface; andan approximately vertical duct comprising: a first approximately vertical wall arranged next to the windshield and defining an approximately vertical interior passageway with the interior surface of the windshield;a second approximately vertical wall arranged next to the first approximately vertical wall and defining an approximately vertical exterior passageway with the first approximately vertical wall, wherein the approximately vertical interior passageway receives air from the exit air duct and the approximately vertical exterior passageway delivers air to the return air duct; anda horizontal duct arranged next to the windshield connected to the exit air duct and the return air duct. 2. The apparatus of claim 1, wherein the approximately vertical duct defines an end chamber where flowing air reverses direction 180 degrees. 3. The apparatus of claim 1, further comprising: the horizontal duct comprising: a first horizontal wall arranged next to the windshield and defining a horizontal interior passageway with the interior surface of the windshield; anda second horizontal wall arranged next to the first horizontal wall and defining a horizontal exterior passageway with the first horizontal wall, wherein the horizontal interior passageway receives air from the exit air duct and the horizontal exterior passageway delivers air to the return air duct. 4. The apparatus of claim 3, wherein the horizontal duct defines an end chamber where flowing air reverses direction 180 degrees. 5. The apparatus of claim 4, further comprising: an A-pillar, wherein the approximately vertical duct defines a heated vertical zone of the windshield that is completely beside the A-pillar. 6. The apparatus of claim 5, further comprising: a manifold, wherein the manifold divides air from the HVAC case into the approximately vertical duct and the horizontal duct. 7. The apparatus of claim 6, wherein the manifold combines air from the approximately vertical duct and the horizontal duct before delivering the air to the return air duct. 8. An apparatus comprising: an HVAC case having an exit air duct and an inlet air duct;a windshield having an interior surface;an approximately vertical duct comprising: a first approximately vertical wall arranged next to the windshield and defining a first approximately vertical interior passageway with the interior surface of the windshield; anda second approximately vertical wall arranged next to the first approximately vertical wall and defining a first approximately vertical exterior passageway with the first wall, wherein the interior passageway receives air from the exit air duct and the first approximately vertical exterior passageway delivers air to the return air duct;a horizontal duct comprising: a first horizontal wall arranged next to the windshield and defining a horizontal interior passageway with the interior surface of the windshield; anda second horizontal wall arranged next to the first horizontal wall and defining a horizontal exterior passageway with the first horizontal wall, wherein the horizontal interior passageway receives air from the exit air duct and the horizontal exterior passageway delivers air to the return air duct; anda manifold that defines a vertical branch and a horizontal branch, the vertical branch connecting to the approximately vertical duct and the horizontal branch connecting to the horizontal duct. 9. The apparatus of claim 8, wherein the manifold further defines a first chamber in which air moves away from the HVAC case, and a second chamber in which air moves toward the HVAC case. 10. The apparatus of claim 9, wherein the first chamber of the manifold directs air into the approximately vertical duct and the horizontal duct. 11. The apparatus of claim 10, wherein: the approximately vertical duct defines an end chamber where flowing air reverses direction 180 degrees, andthe horizontal duct defines an end chamber where flowing air reverses direction 180 degrees. 12. The apparatus of claim 11, wherein: the second approximately vertical wall and the first approximately vertical wall are connected together along parallel longitudinal edges; andthe second horizontal wall and the first horizontal wall are connected together along parallel longitudinal edges. 13. An apparatus comprising: an HVAC case having an exit air duct and an inlet air duct;a windshield having an interior surface;a first air duct comprising: a first air duct interior longitudinal wall arranged next to the windshield and defining a first air duct interior passageway with the interior surface of the windshield; anda first air duct exterior longitudinal wall arranged in part against the first air duct interior longitudinal wall and defining a first air duct exterior passageway;a second air duct comprising: a second air duct interior longitudinal wall arranged next to the windshield and defining a second air duct interior passageway with the interior surface of the windshield; anda second air duct exterior longitudinal wall arranged in part against the second air duct interior longitudinal wall and defining a second air duct exterior passageway with the second air duct interior longitudinal wall; andan air manifold that defines a first chamber and a second chamber, the first chamber directing air into the first air duct interior passageway and the second air duct interior passageway and receiving air from the exit air duct, the second chamber receiving air from first air duct exterior passageway and the second air duct exterior passageway and directing air into the inlet air duct. 14. The apparatus of claim 13, wherein: the first air duct defines an end chamber where flowing air reverses direction 180 degrees, andthe second air duct defines an end chamber where flowing air reverses direction 180 degrees. 15. The apparatus of claim 14, wherein the first air duct and the second air duct are mounted to the windshield. 16. The apparatus of claim 15, wherein: the first air duct interior longitudinal wall and the first air duct exterior longitudinal wall are connected together along parallel longitudinal edges; andthe second air duct interior longitudinal wall and the second air duct exterior longitudinal wall are connected together along parallel longitudinal edges. 17. The apparatus of claim 16, wherein the first air duct is located parallel to a body support structure within which the windshield is secured. 18. The apparatus of claim 17, further comprising: a windshield wiper, wherein the first air duct interior passageway warms an area of the windshield coincident with a maximum non-park position of the windshield wiper. 19. The apparatus of claim 18, wherein the second air duct interior passageway warms an area of the windshield coincident with a park position of the windshield wiper.