Hi;
Our daughter in Phoenix (elevation about 700ft) wants us to take some of her 1-2 year old flock. We live in the higher region of AZ where it's a little over 5300' in elevation. It gets below freezing regularly but my main concern is the altitude difference. Anyone foresee a problem?
Go to ACE and get a Line Voltage Thermostat...used for electric baseboard heaters, et al. They are designed for higher loads than you are planning on and will be quite safe. You only need to wire up one set of contacts for 120vac and if your coop is outside don't forget to plug into a GFIC...