Greenhouse: monitoring conditions in GH, 1 by jimrader

jimrader wrote:
An update
1. in my greenhouse 1 1500 watt electric oil heater warms it 10 degrees
2, 2 each 1500 watt electric oil heater warms it 20 degrees

Delonghi TRD0715T Oil-Filled Radiator Heater Features and Benefits: Adjustable thermostat 3 variable heat settings Permanently sealed, never needs refilling Safety features include thermal cut-off, rust-resistant durable metal construction, fully enclosed heating elements & gently rounded design Back panel Includes noiseless operation & anti-freeze setting that maintains minimal heat temperature Wrap-around cord design Vertical thermal tunnels maximize radiant heat flow while maintaining low surface temperature 24-hr programmable timer with 96 settings Patented pre-assembled wheels