Just think about all the birds that winter over in your ara without any problem! I would not bother with a heat lamp unless the temperature dips below zero (Fahrenheit). Aside from being unnecessary its also a fire hazard.
Recommended coop ventilation is one square foot per bird so five square feet (a completely opened 2x2.5 window) for five chickens. You can get by with 3-4 but the 3" holes drilled into the sides of many coops and probably even the opened space between the rafter is completely inadequate. Chickens give off a great deal of moisture when they breath which can make the coop damp and cause frost bite.
There are lots of helpful coop planning and building articles in the "learning Center" tab on this site including the difference between ventilation and a draft.
Recommended coop ventilation is one square foot per bird so five square feet (a completely opened 2x2.5 window) for five chickens. You can get by with 3-4 but the 3" holes drilled into the sides of many coops and probably even the opened space between the rafter is completely inadequate. Chickens give off a great deal of moisture when they breath which can make the coop damp and cause frost bite.
There are lots of helpful coop planning and building articles in the "learning Center" tab on this site including the difference between ventilation and a draft.
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