Eddie A Houston , TX November 17, 2014 Appliance: Whirlpool Air Conditioner ACE184XP0 Whirlpool Air Conditioner Ace184xp0: Heater stopped working in windows unit. How to replace Element, Heating. The heater element had to be replaced. Thankfully it was replaceable without having to remove any of the ac components. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes