Electrical Questions? Ask an Electrician Online.
Hi, I'm Mike G and I'll be assisting you. You purchased a 2 pole t-stat for a single pole installation. No matter it will work. Just terminate the wires on one side, top and bottom. Cap the unused ones.
Happy Thanksgiving to you. The wires are a hot and a switched hot, no neutral. They should have marked the white with black tape when installed. What it is, is that they break one of the hot lines for a T-stat. Common practice. Your new device is when they break both lines.
Take your time, no hurry.