We were down to 18 last night. It's 17 right now (9 pm). The forecast is for 15 tonight, 12 tomorrow night. The low one night this weekend is to be 9. The 2007 Montanas are tested not to freeze down to zero. That test was at zero so they may go lower without freezing. That is with the furnace running periodically, though. The test to zero degrees is in the 2007 Montana brochure. The other info is what I was told when I asked Keystone this question awhile back. We have the same model and year as you.
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