cold weather controlled outlet

Discussion in 'The Projects Forum' started by alexseattle, Dec 12, 2011.

  1. alexseattle

    Thread Starter New Member

    Dec 12, 2011
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    Hi, I'm new to your forum and need some help. I'm fairly handy and I'm looking to build a simple thermal switch that I can control a light bulb with to keep my swimming pool pump from freezing. the pump is covered in a plywood box, so I'm thinking I can plug in a utility light that is comes on when the temperature drops to freezing, then shuts off when it warms up. I have an exterior outlet I can plug into, but not sure how to build a switch, or if I can buy one somewhere.

    Any help would is appreciated.
     
  2. strantor

    AAC Fanatic!

    Oct 3, 2010
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    You could probably find a LDR circuit used for switching relays based on light, and swap out the LDR for a RTD.
     
  3. strantor

    AAC Fanatic!

    Oct 3, 2010
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  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    Most pumps around here a 75-100W bulb is just left on all the time, rather than controlled to keep the enclosure at borderline freezing.

    An extra kWH/day over a switched solution, so call it 12 cents/day. I think the theory is it's easier to keep something at a temperature than it is to warm it up to that temp.
     
  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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  6. wayneh

    Expert

    Sep 9, 2010
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    That's a pretty cool little device.

    It'll be tough for any DIY solution to beat an off-the-shelf thermostat for this application. You might be able to repurpose the thermostat from an old electric blanket. Or search this forum for egg incubator solutions.
     
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