It's way too early for us to be getting -20F night time lows. It may happen in February but that is also rare. Unfortunately, we didn't check the weather until last night and the -20f weather will hit Wednesday- 2 nights time. The cold snap will last at least a week with daytime temps in single digits or low teens. First 3 nights in the -'s. Recently we've had some +20F night time temps but in Boulder, CO, we have varying temps. Last 5 nights were above freezing. Given the drastic 50 degree difference in low temps, can the chickens handle this quick of a change? We will cover the known drafts and block the window- leaving enough openings for ventilation. However, even our water heater says it may not work with temps below -10f. We have a regular heat lamp that we can turn on, but will that be enough? Do we need to bring them in the garage with some heaters? Breeds: buff orp, speckled sussex, astrolorp, brahma, aurancana, wyandotte, long island reds. I have read the below article but I'm concerned about the drastic drop in temps and whether the chickens can handle going from today's 57f to Wednesday's 9F. To me, it doesn't seem like they would have feathered out enough to handle these drastic changes. https://www.backyardchickens.com/a/winter-coop-temperatures Coop bedding is pine shavings. I have cracked corn to feed them as well. We rarely get nights below 0F. Any recommendations? Many thanks.