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i use it at 30*.
i don't have to idle the truck to get warm air. i have a timer turn on the heater 3 hours before I leave and I start driving within 2 minutes of starting. warm air almost immediately (enough to defog the windshield), hot air in 5 minutes
 

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I don't know about heavy duty, but I got a $7 Brinks timer at walmart a few weeks back. Does a fine job.:thumbsup:
 

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I didn't want to trust one the wife uses for the xmas tree, so I picked one up at Rural King for $9. Indoor\outdoor and 3 prong, peace of mind.
 
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