A thermistor and preset pot lets you set the temperature at which the relay will energize.
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Temperature Switch No.2 - Photograph

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Thermostat No.2
Schematic
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When The Temperature Falls - The Relay Energizes

This is a photograph of Thermistor Controlled Relay No.2. The variable resistor lets you set the temperature level below which the relay will energize. A second version of this circuit - Thermistor Controlled Relay No.1 - will energize the relay when the temperature rises above the preset level.


A Photo Of Ron J's 
Temperature Controlled 
Relay Circuit No.2


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Thermostat No.2
Schematic
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