We have a 2720SL and the heater is under the sofa as has been described. We us an electric heater that has 2 heat levels, 750 and 1000 watts. Most of the time we only use the electric heater. When we do have to use the gas heater we set the electric heater on low heat and keep the fan running. When the temperature drops, the gas heater comes on for a few minutes.
For the bed we have an electric blanket. We turn it ON about an hour before going to bed so as to have the bed 'toasty' warm when we get in. As a plus we lay our PJ's on the bed so they will be warm also. Most of the time, after we get into bed, we set the blanket on the lowest setting, or turn it OFF.
We don't often camp in extremely cold weather but a few times we've camped when the temp was in the teens and twentys.
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Joe from Virginia
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