The portable A/C unit showed up today. We were expecting "a little bit" of negative pressure as the unit vents hot air to the outdoors. It's more than "a little bit" of negative pressure. With the unit turned on it is quite difficult to get the door open. But, we had anticipated this and had a plan. The plan is to cut a 6 inch round hole through the far wall and silicone in a piece of PVC pipe. On the outside, we'll cap off the vent with an aftermarket automotive air cleaner/filter. It will be protected from the weather as that wall is inside our shop.

If this portable A/C unit doesn't work out for the "room" we'll move on to Plan B. Plan B is to put in a wall mounted A/C unit and utilize the portable unit in the kitchen during the summer as it is always a hot spot on summer afternoons.

So, the experiment continues.

Before you ask, yes, there is a Plan C. Plan C is to air condition the entire shop (600 square feet) then have passive intakes on the "room" and and run an active exhaust. Fortunately, the entire shop is insulated very well.