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Well all conventional air conditioners are strictly heat pumps, but when we say heat pump everyone usually means bi-directional heat pumps - ones that can provide heating as well as cooling. My Amazon results are not that and I was recently reading about them coming to market starting at $2k.
You don’t execute C source files. They have to be compiled.
First point as someone else commented, that driver is already present in any mainstream kernel. It’s very unlikely you have any need to build it.
But if you really want to build it the command will be
make
that will get instructions from Makefile on how to build the driver. But there will be other tools and libraries needed.