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What kind of duct are you using? How is your setup routed on the window. Right now I lower our receiving site on top and put cars board sheets on the gaps. I like you're design.
My H140 does the same thing, It seems like it heats up then turns off the flame then reaches its cool down point and restarts. I have been running mine 12 hours a week for the last month and i don't see any issues with it.