Bruce
Herd Master
I wouldn't be to comfortable with constantly freezing and thawing PEX. Yes it can take more than copper or PVC but it is still taking a hit everytime it freezes. And blowing a fitting instead of rupturing the "pipe" still makes a big mess, it is just easier to fix 
Given a choice I would prefer that wellhouse be on the south side so the sun can warm it. But there is no windchill in it due to the constant west winds. The temp inside will be the same as the temp outside (barring any sun warming). I bet you do get some good "clippers" given your location!!
I'm sure the new drilled well will ease your life and concerns substantially. New source pipe below frost level all the way under the house!
Now what is wrong with a nice "open" well?? The contractors found this one when they were excavating to replace the foundation under the north building of the house. Covered with a large and very heavy piece of sheet steel and a bunch of what I think are drift cutters. I SO wish it had been 15' farther (it was not even 2') from the house, we could have put a nice little well and bucket house over it. I don't even know how someone builds a well like this. It was ~13' deep with 7' of water in it. How do you get rid of the water so you can build up all the stone??

The guy that lives in the property south of us grew up in this house. When his father died in 1999 the house was sold (I think he already lived next door. His 10 acres used to be part of this property). I asked if he knew about the well and he did. There is another similar one (not as deep or nearly as nicely made) out in the woods north of the NW field. And there is a square cement one between the pond and the natural wetland to the north. I really don't understand this one. Not sure what that square in the upper left is. I can imagine the pipe coming in from the left would be "source" since that direction is uphill. But the one going out to the right?? Seems like one wouldn't want the water to go out. There is a fitting of some sort on the pipe, I ASSUME for the pump (probably manual) but that pipe clearly goes through the wall. In the spring it can be full to the top, later in summer, quite dry.

The drilled well, right in front of the house, was done in 1979. That must have been a spectacular day for the family.
Given a choice I would prefer that wellhouse be on the south side so the sun can warm it. But there is no windchill in it due to the constant west winds. The temp inside will be the same as the temp outside (barring any sun warming). I bet you do get some good "clippers" given your location!!
I'm sure the new drilled well will ease your life and concerns substantially. New source pipe below frost level all the way under the house!
Now what is wrong with a nice "open" well?? The contractors found this one when they were excavating to replace the foundation under the north building of the house. Covered with a large and very heavy piece of sheet steel and a bunch of what I think are drift cutters. I SO wish it had been 15' farther (it was not even 2') from the house, we could have put a nice little well and bucket house over it. I don't even know how someone builds a well like this. It was ~13' deep with 7' of water in it. How do you get rid of the water so you can build up all the stone??

The guy that lives in the property south of us grew up in this house. When his father died in 1999 the house was sold (I think he already lived next door. His 10 acres used to be part of this property). I asked if he knew about the well and he did. There is another similar one (not as deep or nearly as nicely made) out in the woods north of the NW field. And there is a square cement one between the pond and the natural wetland to the north. I really don't understand this one. Not sure what that square in the upper left is. I can imagine the pipe coming in from the left would be "source" since that direction is uphill. But the one going out to the right?? Seems like one wouldn't want the water to go out. There is a fitting of some sort on the pipe, I ASSUME for the pump (probably manual) but that pipe clearly goes through the wall. In the spring it can be full to the top, later in summer, quite dry.

The drilled well, right in front of the house, was done in 1979. That must have been a spectacular day for the family.

They put it on the west side of the house, and those vents i mentioned up at the roof line they put those going east-west too....so the wind whips thru the well house ceiling stealing any possible heat you might have in there. Because it is an open top well it normally would keep the well house above freezing because the well water doesnt freeze, but since the heat wind blows any warmth out it freezes. We covered the vents but the windows are trailer house type windows...single pane glass and the west window does not seal all the way, so we put insulation over the windows and a board over that to stop the draft which was directly on the well pump/pressure tank. Basically whoever built it is a moron....and the well house is only 12yrs old..it should not be in this condition if it had been taken care of at all or more thoughtfully planned out. We also dont really get sun here in winter so that wouldnt matter much, we get approx 170 days of sunshine/year and most of those are in summer/fall.
I would guess it is 10' to 12' deep. Maybe 6' or 8' square? I never thought about it much. It has a sloped metal roof (wood framed) with a square "cap" that I took off to get the picture. Great info on that square hole in the bottom being the "inlet" for ground water.