I have 4 large chickens and am wondering if I need more square feet inside my coop. This is the current dimensions. 
 
Also it gets very cold in the winter here do I need a heat lamp or something in the coop
	
		
			
		
		
	
				
			- Chinese Fir chicken coop holds up to 4 chickens
 - Features 2 access doors and a perch
 - 1 roof section lifts off for easy cleaning
 - Ramp leads to lower caged section
 - Measures 76L x 28.75D x 44.25H inches
 - Exercise pen roof: 37H in., highest point; 24H in. lowest point
 
Also it gets very cold in the winter here do I need a heat lamp or something in the coop
	