Techshop
If you have some components all ready or can find them extremely cheap you may be able to build one cheap. But I had seen some quite reasonably priced heat-pumps on E-bay. Already properly sized and tested.
Yes you can build your own and yes it will work just fine but it may take some experimentation.
One consideration for you if your thinking of the ultimate heated floor, Mikesolar and myself had been thinking a direct DX may be possible for heating real inexpensively.
Randen
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