Patent ID: 7217461

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: at least a first layer comprising silver sandwiched between and contacting first and second contact layers, wherein the first contact layer is located below said layer comprising silver and is oxided to a lesser extent than is the second contact layer located above said layer comprising silver, so that moving away from the one glass substrate that supports the coating the coating comprises the first contact layer, the first layer comprising silver, and then the second contact layer; wherein said first contact layer comprises an oxide of Ni and/or Cr and is located between and contacting said layer comprising silver which is above said first contact layer and a layer comprising zinc oxide which is below said first contact layer, so that the layer comprising zinc oxide is located between at least the first contact layer and the one glass substrate that supports the coating; and wherein the IG window unit has a visible transmission of from 40 to 60%, a selectivity (T vis /SF) of at least 1.75, and a solar factor (SF) of no greater than 27.5.