Folks,
I have seen various threads about our block heaters, and the old "when do you plug in question?" I use a portable thermostat similar to those in the links that are included here. Just mount the Thermostat, and plug in the car's heater, and set the temperature......my thermostat has a range of -10*F to 100*F......and I set it at around 20*F......

http://kkontrols.com/poth8ftco.html

http://www.infraredheaters.com/kt-121.htm

Most Garden, Greenhouse, and Farm/Feed Stores carry them as well.....also on Amazon.....or just Google "Portable Thermostat"......

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG

good idea for southerners. If I used one, it would be on for months at a time- so a timer works better for me.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.