Hi Bev,
I have the same problem here in Whistler. Here is my magical fix that worked very well for me.
I ran some plastic airline tubing of 1" in diameter from the closest window of my condo to the air intake of my skimmer. I have a HOB Prism Pro. I loosely taped the tube to the intake adjustment knob and left the other end in the window which is only open a little bit so the rest of the apartment does not get cold.
After a few days my tank ph was right back to where it should be
!
HTH, and good luck!
Rob