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With the amount of insulation you would have to put on the assembly, I am not sure the 5w bulb would be highly relevant My husband points out that you could in principle heat YOUR ENTIRE HOUSE IN ALASKA with a 5w bulb (given enough time for things to warm up) if you had "good enough"...

Quote: Well, I'm sorry, I'm not a physicist or a fireman, I just know what actually happens when you try to warm things up with various wattages in cold weather, because I have DONE it a lot. Remember there is a lot of heat loss going on at -20F. You cannot have perfect insulation, a) because...

Quote: It's likely to take more than that -- the 3-gal fonts they sell with the heating element built into the base (so it is embedded in thin plastic that is in direct contact with the water in the font) draw something like 100-125 watts (I forget exactly). When people make cookie-tin or...

Quote: I totally 100% agree with the first part of this post, about why heat the whole coop; but I have to say that there is absolutely no need whatsoever for heated roosts, that's what chickens have FEATHERS for As long as they have a warm enough surface to walk around on during the day...

Quote: Gee, even though I think it's largely irrelevant to the o.p.'s needs I was getting excited on behalf of the many folks who want to run a plain ol' lightbulb for day-extending purposes... but then I saw the part where it is not rated for use at temperatures below freezing Do you by any...

Quote: MUCH MUCH CHEAPER AND EASIER two-part solution: a) accept that a few eggs may freeze. (Not as many as you may think, if you can collect eggs in late afternoon. It actually takes eggs a considerable while to freeze, first because they start out at a temperature of roughly 100 F...

Quote: I'm sorry, but what you describe will need much more than just one car battery. A single 250w heat lamp will probably not be sufficient to raise that size area to 40 F (! - see below) unless you have massive insulation; and even just ONE 250-watter will require more than one car...