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Old 06-24-2019, 07:28 PM   #2
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MJC62's Avatar
Brand: Thor Motor Coach
Model: A.C.E. 27.2
State: Indiana
Posts: 599
THOR #14698
The roof A/C on all motorhomes Class A, C or B runs off 120 volt ac current. That requires the generator to operate while off shore power. If it were me I would see if the dash a/c was sufficient to cool the coach while traveling before running the roof ac. Besides the genny hours adding up running roof a/c will burn more fuel. To help with air flow we always open the farthest rear roof vent to allow the cool air to flow through the motorhome.
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