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by toast0 1383 days ago
If they only have a gas furnace, then they may not have an outside unit currently. Piping a refrigerant line and signalling from where the furnace is to a suitable location for the outside unit may be easy or hard depending on their home.

Of course, if they have a furnace and an air conditioner, it's a lot easier to change to a heat pump and that's it (or more likely, a heat pump and just in case resistive heating)