I also live in Canada(Alberta) and started getting frozen eggs this week. I leave for work at 6:30 and dont get home till 3:30 which by that time the eggs are frozen(cracked) everyday. Has anyone found a solution for keeping the eggs from freezing???
As a note its been -20celsius (-4 F) or colder for this week. I dont run a heater in the coop as it seems that they walk around outside all day and dont mind the cold, my issue is i hate going out to find broken eggs everyday. what a waste.
Hi, this is kind of an old thread but I ve stumbled upon it and would like to chime in!

As for frozen eggs, I got rid of my old tin nest boxes and built wooden ones (hoping the wood would hold onto heat better than tin), and I also put a piece of that foil bubble insulation under the bedding in each box. My theory was to at least delay the freezing slightly and so far this seems to be working better with only the occasional frozen egg. I have been toying with the idea of running a heat tape under the nest boxes on a timer to keep eggs unfrozen on the days I don't get home til late, but am concerned about potential fire hazard. Thoughts, anyone?
I also want to mention that I'm north of Edmonton AB and also don't heat my coop. The last couple winters I did so with a heat lamp but chose not to this year for several reasons, and am finding my birds are healthier and actually go outside in their covered run almost daily (which they rarely did when the coop was heated).
Their coop is insulated but I also have vent holes near the ceiling and a small duct fan running constantly, pushing condensation out. I have poop boards under the roosts which i clean off daily to reduce humidity (albeit minimally I'm sure!). As well I use a homemade heated water bucket with drinking nipples so no open water. Seems to me humidity is way more the killer than the cold!
I chose not to heat the coop this year because:
1. Picking broken bulb glass out of bedding is not fun
2. We experience power shut offs on occasion and I didn't want the birds to be cold-shocked in the event of sudden no-heat (same for broken/dead bulbs)
3. Cost
4. Fire hazard
I was worried at first goimg into this winter but other than the odd frozen egg, I'm glad I made the switch and won't be going back to heating! I mean, chickens have been kept in north america for how long without heat bulbs!

that's what I keep reminding myself.
Cheers!