“For scores of historic house museums, simply keeping the lights on has become a challenge. The Mount, Edith Wharton’s home in Lenox, Mass., is trying to stave off foreclosure with a feverish fundraising campaign. The Mark Twain House in Hartford can’t even afford to buy energy-saving light bulbs that would slash its electric bill. Experts say this summer may make or break some sites, many of which already have cut their hours and staff and are struggling for donations in today’s troubled economy.”