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I run the catalytic when the temps are in the high 40's, 50's and just into the 60's. When temps start dropping into the lower 40's and 30's, I also turn my 30,000 BTU furnace on to help circulate heat. In real cold weather when boondocking without 110 v. shorepower, the furnace can run the batteries low. I have not experienced a battery problem over a weekend of 30's weather while running just the furnace.
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Craig
AIR #0078
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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