5T for a 'small cabin' ? Even in lower lattitudes of Quebec, it would appear that a few $$ spent on insulation would be a better first investement in effort.
Given the cost of Cu these days, you may want to do a trade on building a tube in tube evaporator (about 70 ft of 3/4" Cu inside 1-1/2 ply for 5T) to use water from a poly loop to your HP source. Unless you are on a hillside and the ground water is flowing, you will still need a few hundred (or thousand) of feet of buried line for 5T.
If water is only 5 ft deep, how about a pump and dump or 2 shallow wells on opposite corneres of your property (if only a small parcel) for a pump and return system (using the same type tube in tube DIY evaporator)
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