why is it easier to heat things up, than it is to cool them down?
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It depends a lot on what you mean. But generally it is easier to add energy to things than to remove energy.
If you want to cool something below its surrounding you need to use a refrigeration cycle, which requires various components like tubes compressors and refrigeration gas.
This cycle allows you to move energy from the object you wish to cool, and add it to the surroundings. The bigger the difference in temperature, the harder this becomes.
It is also possible to heat things by taking heat from the surroundings and moving it to an object. This is the same cycle but just in reverse. This cycle has the added efficiency of any heat created by the device is added to the object.
But there are easier ways to heat things. Just make the surrounding super hot by creating a fire and such.
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