If there's a limit to cold, but no limit to heat, doesn't that mean that the universe will get hotter ..

Your question suggests that you are unduly hung up on the particular scales we use to measure temperature.

It isn't an easy concept, but if you think about long enough, you may understand that what you say is not actually a property of temperature as such, but of our particular ways of measuring temperature. It wouldn't be a particular challenge to come up with a temperature scale on which absolute zero was infinitely far away, too. In fact, if you think about rather more, our existing temperature scale is rather odd. At least for some purposes, it is possible to attain a temperature of infinity - and then to go beyond it! What is even odder is that the temperature immediately above infinity is minus infinity!

In any case, the answer to your question is simply 'No'. The universe is cooling, and will, as far as our current understanding takes us, continue to do so for ever as it expands at an ever-accelerating rate.

No. Everything is in the process of breaking down, spending energy along the way. Movement creates heat, and once all that movement stops, and everything breaks down, that's it. The universe, and eventually existence itself drops down to absolute zero.

Sure. All you have to do is break all four laws of thermodynamics. Please take a basic physics course.

http://www.physicsplanet.com/articles/th…

SPOTD.

Yes. I DO understand. You know what? It does NOT scare me. "Knowledge IS POWER." As Morgan Freeman says over and over on the Science Channel, "...Question everything." including your own assumptions.

where do you suggest all this heat is going to come from?

As the universe expands and ages it should get colder and colder until eventually the entire universe is the merest bit in excess of absolute zero.

No.

Everything will reach the lower limit.

I purpose we set laws to prevent Universial heating! Think about the space polar bears!