watts divided by volts equal amps
14 ga extension cords are good for a max of 15 amps up to 100' after that voltage drop would come into play. No problem running a light bulb or maybe a small heated waterer. Her in La we do not need the heated waterers so I am not familiar with electrical requirements, but I assume it can't be much over 100-200 watts. I'll cruise on over to
TSC catalog store and see what I can find out.
200' of run with out a doubt you need 12 ga cords. However 12 ga cords equaling that length will cost you a pile of money. For sure over $100.
This is what I would do.
Exactly what Joe says-----
With one difference, I'd go myself to a Mom and Pop hardware store. You can forget getting any expert help at the HD, Lowes or
TSC any more, you will be lucky to find a dead head high school kid putting 110 volt recpticles into the wrong display boxes. Years ago HD made practice of hiring "experts" that is no longer true.
Buy 1- 250' roll of 12/2 wg romex, use it for your extension cord. Along with the romex buy 200+ (or the length required) of 3/4" PVC conduit. Put the romex in the conduit. Install heavy duty plugs on each end. Use as extension cord.
Then in spring when the ground thaws, you have 99% of the material required to install a proper electrical service to the chicken house. And you will only have purchased what you need.
Cost of the romex should be somewhere around $100, conduit is about $10 per 100', plugs, proper water tight fittings for conduit and glue $25-$30. If you buy 200' of 12 ga extension cord it will run your coop, but next winter you are going to be right where you are now, if you buy the romex/ conduit and install the line properly it will be a slightly higher cost now, but you will be set forever.