Loewen Window Center of the Upper Valley ShoppingHome FurnishingsConstruction Management Loewen Window Center of the Upper Valley Visit Website 15 Railroad Row White River Junction, VT 05001 (802) 296-6555 (802) 295-5554 (fax) Loewen Window Center of the Upper Valley About About Retail distributor of fine windows, doors and architectual hardware. Our flagship product is Loewen; a 102 year old, third generation, family owned manufacturer.