I hope this question hasn't been asked a million times already, and all the experts are tired of it!

I'm getting my set-up ready for my future ball pythons. Set it up yesterday, and let it sit overnight to see how temperatures and humidity stabilize out. I did NOT mist it, just to see what ambient humidity would be. I have an under-tank heat pad with a thermostat, using aspen, and a small water bowl (probably about a cup total volume if filled to the top), using an Accu-Rite indoor/outdoor thermometer/hygrometer for accurate readings. This morning, after the coldest part of the day, I'm reading 50% humidity (misting should help raise that, just need to find out by how much), and 72/77*F for temperatures. Obviously too cold. The thermostat was reading the temperature under the substrate as 85*F, and all temperatures are now rising because the house is starting to warm up from the night, but still obviously too cold.

What is going to be the best way for me to raise ambient temperatures of this bin?
I have a heat lamp with a red light I could shine on just the hot side. I also have a space heater I could point toward it. I do not want to warm up my whole house to 80*F though. Summer time is NOT going to be an issue, since I can't get the house less than 84 at that time, even with the A/C running non-stop (able to breath again now that the electric bills are a little lower!). I have read, being nocturnal animals, ball pythons don't like bright light, which is why I would use the red bulb (used it for my chick brooder, and effectively kept them at about 100*F). But I can use the space heater if it would be a better option, I just won't have as much control over it (it does have a built-in thermostat, but it is NOT very accurate).