^ All excellent points to keep in mind. I've been on well water for several decades, in a couple of different locations. If your water is good for the fish you want to keep...or, to put it differently, if you are happy keeping fish which are suited to your water...then having an essentially limitless supply of water that requires no treatment other than adjusting the temperature is an absolute joy.
As far as temperature goes, your well water will be much colder than you probably want for your tanks. I have recently put in a small on-demand tankless water heater which gives me the temperature I need without wasting energy on keeping it warm when I don't need it. In the past, I used large water storage tanks with aquarium heaters in them to preheat the water, but this limits how much you have on hand at any given time.
I will just mention one other thing that nobody seems to think of: your septic system. A septic field has a limited useable life, after which it clogs and requires very expensive work. The less water you flush down your drains and through your septic field, the longer your field will last, so it is important that you arrange for other ways to dispose of your used tank water when doing water changes. If your fish room is above grade, you can siphon out a window and direct the water to flower beds, gardens, etc. With a basement fishroom, use a pump to exhaust the water to a similar location outdoors. In either case,
do not drain large amounts of aquarium water into your septic system. The old fish water is perfect for watering plants for the same reason that it is bad for your tank, i.e. it is loaded with nutrients. Also, using it this way reduces the strain on your well and pump since you won't be drawing new water for the plants.
Congrats on moving to the country; life is about to get a lot better!
