Yesterday (12/28) it was 36F outside and 35F inside at 6:37am. This is when I turned on the heater. It heated up rather quickly to 42F inside by 6:44am, but then thermal mass kicked in and started slowing the rate down. After that, it increased about half a degree every minute till 6:57 it was at 49.3F. This was with the thermometer approximately 5' from the heater. At the end, I turned off the heater's fan and moved the thermostat to within a foot of the heater for a minute. From 6:58 to 6:59, the thermometer went from 49.3F to 52.2F. I then turned the heater off and after 10 minutes, it dropped to 51.5F.
Today it was somewhat colder out. At 6:29am, it was 29.5F outside, 28.5F inside. The van seems to drop slightly colder inside than outside during the night. I didn't run the heater near as long today. The rate of increase was rather slow. The biggest jump was between 6:29 and 6:31 - from 29.5 to 32.2. Then: 6:33 was 33.1 and 6:34 saw 33.5. By 6:44, it was 38F inside.
So while being directly in front of the heater was warm enough to get changed and such, if the temperatures drop much below 30F, I may have to try running both heaters, or add the van's heater into the mix. However, once I'm changed and under the sleeping bag, it really doesn't matter too much about the temperature of the van.
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