Patent ID: 7189458

Claim:
An insulating glass (IG) window unit comprising: first and second glass substrates, and a coating supported by one of the substrates, the coating comprising: first and second infrared (IR) reflecting layers comprising silver provided between at least a pair of dielectric layers, so that the coating has only two IR reflecting layers; at least one of the IR reflecting layers comprising silver being sandwiched between and contacting first and second contact layers, each of said first and second contact layers comprising an oxide, wherein the first contact layer is located below said IR reflecting layer and is oxided to a lesser extent than is the second contact layer located above said IR reflecting layer; wherein said first contact layer comprises an oxide of Ni and/or Cr and is located between and contacting said one IR reflecting layer comprising silver which is above said first contact layer and a layer comprising zinc oxide which is below said first contact layer; wherein the IG window unit has a visible transmission of from about 50 to 70%, a selectivity (T vis /SF) of at least 1.75, and a solar factor (SF) of no greater than 35.0; and wherein the coating comprises at least the following layers from the substrate which supports the coating outwardly: a first dielectric layer; another layer comprising zinc oxide; the first IR reflecting layer comprising silver; a contact layer comprising an oxide of Ni and/or Cr; a second dielectric layer; said layer comprising zinc oxide; said first contact layer; said second IR reflecting layer comprising silver; said second contact layer; a third dielectric layer; and an overcoat layer.