Although my birds live in my front hallway, I have always used a small heater to keep the temp around 55 F. The problem is that conventional fan/element heaters always seem to clog up with the fine dust the chickens create from scratching around in the pine shavings. I even bought heaters with filters, but these would need cleaning every few days. I have been wanting to move my chooks into a back porch area of the house that is unheated & faces the prevailing northerly winds. It was a couple degrees above freezing this morning, & I knew it would need to be heated for the girls. I purchased an oil filled 1500 watt radiant type heater. No fan to clog up, & no exposed wire element that could pose a fire hazard. It heated this 63 sq ft room to chicken comfy in less than an hr. It was less than $70 & has a timer which can be set in 15 min increments & is adjustable with 600/900/1500 watt settings. I think my girls are going to be very cozy in their new home this cold Canadian winter.