Yeah - there's a tax credit on windows up to 30% - OR $1,500 max. Still it's a help for renovations on your primary home. The credit is not available for improvements to a 2nd or vacation home.

$19,000, while a lot of money seems about right. Higher quality Pella or Andersen windows would probablly run more like $25,000-30,000.

From the Energy Star website:
Qualifying products purchased between January 1, 2009 and December 31, 2010 are eligible for a tax credit equal to 30 percent of the product cost. Installation is not included; be sure to obtain an itemized invoice from your retailer or installer. The maximum amount of homeowner credit for all improvements combined (including roofing, insulation, HVAC, and water heaters) is $1,500 during 2009 and 2010.