"Texas Tech has everything I've been looking for in a school," Duffey said.
Duffey received an offer from Texas Tech on Monday night after coach Eric Morris made a trip to Mansfield to watch him practice.
According to Duffey, that was his first big offer after his MVP performance at The Opening Regionals in Charlotte last weekend, where he also received an invitation to compete with the best quarterbacks in the nation at the Elite 11 in Oregon.
Duffey is rated as a three-star prospect, as the No. 8 quarterback in Texas and the No. 43 signal caller in the country by Scout.
He said he decided to commit because he felt welcome by the whole program.
"It feels great. I was very welcomed by the coaches, fan base, and my family is very excited," Duffy said.
This 6-foot, 180-pound dual-threat quarterback threw for 2,259 yards, 20 touchdowns and rushed for 1,103 yards and 19 scores his junior season.
"Their offense fits great with how I play," Duffey said.
He added that he knows Kliff Kingsbury is a great quarterbacks coach and he can't wait to learn under him and the rest of the quarterback group at Tech.
"It's a blessing, I can't wait to get there and play in front of them," Duffey said.
He will be an early enrollee and make it to campus after he graduates from Lake Ridge in December.
Duffey plans to major in Sports Medicine and said that he knows he can get a great education at Texas Tech, another big factor in his commitment.
Duffey added playing for Texas Tech puts the Red Raiders "one step away from being the top program."