Eddie A Houston , TX November 17, 2014 Appliance: Whirlpool Air Conditioner ACE184XP0 Heater stopped working in windows unit The heater element had to be replaced. Thankfully it was replaceable without having to remove any of the ac components. Read More... 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Nut Drivers, Screwdrivers