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How to Install a Portable Air Conditioner

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey offers a quick and easy way to cool off a room.

In this video, This Old House plumbing and heating expert Richard Trethewey explains how to get air conditioning where window units aren't practical.

Steps for Installing a Portable Air Conditioner

  1. If there's no existing wall vent, use a jigsaw to cut a 4-inch-diameter hole through an exterior wall.
  2. Apply silicone caulk to the rear flange on wall vent.
  3. From outside, slide wall vent through hole in wall; secure with stainless steel screws.
  4. Twist and lock the flexible duct to the exhaust port on rear of air conditioner unit.
  5. Connect the duct end to the wall vent and seal with foil duct tape.
  6. Plug air conditioner unit into an electrical outlet.
  7. Turn on unit, then set thermostat and, if desired, the automatic timer.