hot/cold side newbie

[greenacid]

So I'm just gonna come out and admit this.

I have no idea how to make a hot and cold side for my bp.
I was under the impression that the hot side is considered the side with the heat mat, and the cold side is a side you have a basking light on. My current set up is a 20 gallon tank (No clue maker) with a push screen lid that has 2 built in clips on the frame, inch of desert snow substrate, 2 medium size hides (identical), the correct moss for humidity, medium exo Terra heat pad rainforest, hydrofarm thermostat, water bowl, zoo med night and day timer hooked up to a zoo med mini combo deep dome. One side has an infrared and the other a day time bulb. Both 75 watts. A hygrometer and a thermometer.

I have the heat pad on the right, the bulbs hanging over the left, hide on either side, water in the middle. My over all cage temp says 84. I only have one thermometer at the moment, and humidity is 50. I have my thermostat set to 93. Kicks off at 93 and back on at 88.

How do I make a hot and cold spot out of what I have? My boy is 5 months, almost 2 feet long, eats just fine, is not seen during the day, out at night, but yet I feel like I'm doing something wrong. please keep in mind I'm broke ATM but I can return a few things because they were just bought. Also, I went with heating lamps because I live in a house with ac on 70 all day. Even at night.

Help