He recorded his first hit for Houston on a fifth-inning double.
Manager Brad Mills said he doesn't envision using Pearce as an everyday player, but he can play the corner spots in the outfield, as well as first base.
"He will get plenty of playing time," Mills said.
Pearce was hitting .254 with four doubles, three homers and 14 RBIs in 28 games for the Orioles this year. He began the season with Triple-A Scranton/Wilkes-Barre in the Yankees organization, hitting .318 with 11 homers and 30 RBIs before being traded to Baltimore.
"I talked to the manager, and he said there's an opportunity here," Pearce said. "I look forward to being here. I'm happy to be back here in the this league and just have to take advantage of the opportunity."