195 posts, read 485,411 times 28,459 posts, read 44,439,670 times Originally Posted by Ohiogirl81 According to instructions, "Avoid fire hazard or electric shock. Do not use an extension cord or an adaptor plug." Have you actually ever had your AC power supply cord connected to an extension cord? If so, ever had any problems? 29,041 posts, read 27,163,992 times Originally Posted by PacificWest Standard warning to prevent lawsuits, too many people hooking them up to little extension cords that might be OK for a single light. You need a heavy duty extension cord. Big hefty heavy duty extension cords, but extension cords nonetheless. This is the easier explanation of #6. Problem is most people don't use heavyduty extension cords. Which in turn cause the extension cord to heat up then melt and most likely start a fire even before the breaker finally pops. 5,058 posts, read 10,689,021 times Yes, the extension cord I use is about 2 feet long and about a half inch in diameter, made expressly for window AC units;