We live in Texas. -usually mild temps in the winter (am more concerned in the summer due to excessive heat). Anyway, we've had temps in the upper 70s last week/40s at night. -had a few "cold" days with highs in the 40s/lows around freezing which is no big deal. Today, high was 25. -low will be around 8/10 tonight (water already freezing in the coop). Our hens are quite old, and there is no "gradually getting used to" these temp fluctuations. They're pretty severe. I've placed two heat lamps in the coop (8 x 12 shed conversion). They are secured (with two sources each) from sturdy rafters (about 2 ft. from the roof, and about 7 - 8 feet from the ground). They have been thoroughly cleaned, as well as the front of the coop where they're suspended (no cobwebs/dust). There are no shavings on the floor in this part of the coop because it is separated by a wall of hardware cloth from the part housing the birds. The (outdoor) extension cord is off of the ground. I can't think of any possible fire hazards, but I'm not used to any type of heat sources for chickens either. I know chickens are feathered and adapted for cold temps. -just extreme to have severe fluctuations with very little time in between (50s-70s one day, 20s the next) Thoughts??