The 2007 Hummer H3 is offered in a base model ($29,995), Adventure ($32,070), and Luxury ($33,225) trim level. All are powered by a 3.7-liter engine generating 242 horseppwer as a manual transmission with five speeds. (An automatic with four speeds is optional.) The drivetrain has two speeds with electronic control and all-time 4WD.

The H3 has room for five. The seats in the base model and the Adventure are upholstered in cloth with leather on the Luxury. In all models occupants enjoy the protection of twin air bags with a sensor system for the passenger. Bags in the curtain position are optional. A centralized information center dispatches as many as 22 alerts to the driver and a one-year contract with the OnStar service is included. An alarm system protects the vehicle's contests and the PASSLock system is employed to deter theft. Entry can be made via a remote which includes a panic button. The included audio unit as a since-disc CD player in the dash with an option for one with a capacity for six disc. (XM Satellite Radio is also optional on all models.)

The 2007 Hummer H3 offers a clearance of 8.5 inches and can pass through water up to a debt of 24 inches at 5 mph. The approach angle is 37.5 degrees, departure angle 35.5 degrees, and breakover angle 23.5 degrees. The H3 will handle trailers of up to 3,000 lbs. with the manual transmission; 4,500 lbs. with the optional automatic.