I live in north western Vermont, 5 miles from the Canadian border. I was able to keep the 4 standard size hens I had last winter happy in their hen house without electricity by useing solar gain to their advantage. The hen house is a converted 4 x 6 x 5 ice fishing shanty that we fully insulated with compressed foam insulation scavanged from neighbors construction projects. We also installed a reclaimed insulated window on the south side of the hen house. We put 2 vents in just below the roof on the East and West walls. The vents had floor vent covers from Lowes with a closeable louver which we could adjust. We also used duct tape over the vents when there was extreem cold and wind. Our pop door is a double door, with an outer and inner door. The attached run was covered in polycarbonate panels and 6 mil plastic, creating a "green house" effect during the day. The plastic also kept out the south wind.
We had a 5 day stretch where the temps went to -25 below at night. I do not do the deep litter method and wanted to be sure that the hens had additional warmth at night durin that cold spell so I used several 4 gallon jugs (from cat litter) filled with HOT tap water to bring up the temps in the hen house a little.
My hens had no problems with the cold here. The only thing I needed to be aware of is fresh, unfrozen water.
We had a 5 day stretch where the temps went to -25 below at night. I do not do the deep litter method and wanted to be sure that the hens had additional warmth at night durin that cold spell so I used several 4 gallon jugs (from cat litter) filled with HOT tap water to bring up the temps in the hen house a little.
My hens had no problems with the cold here. The only thing I needed to be aware of is fresh, unfrozen water.