By Vinny Pinto
Edited on 7/16/2021
I own one ZERO BREEZE Mark 2, which I have had in use for about a month now, in summertime hot weather in the mountains of NW Maryland for use in cooling my meditation dome, and I just ordered another one a week ago (for use in another outbuilding).
Speaking (well, writing...) as an engineer and a scientist, I can tell you that The ZERO BREEZE Mark 2 that I have in use here meets or EXCEEDS all published specs regarding cooling BTUs, extremely low sound level (seriously, it's about ten billion times quieter than an inexpensive 5,000 BTU window air conditioner), etc., and I use it to cool a 16.5 ft. diameter (very-well-insulated; even the door and door window are well-insulated) meditation dome with a floor area of ~215 square feet (SF) and a ceiling height of 10.5 ft. in my mountainside yard, and, on the very hottest days, it keeps the interior air about 6 degrees cooler than it would otherwise have been, and it also reduces the humidity of the interior air by another 15% to 20% than would otherwise be the case!
So, I love my ZERO BREEZE Mark 2! Again speaking as an engineer and a scientist, I can tell you that I feel that the unit is very well-designed and well-constructed.
BTW, I will admit upfront that my installation is optimal, and that I have maximized every possible factor to help the Mark 2 to run as efficiently as possible. For example:
The ZB M2 unit is located outdoors, just outside the dome in a largely sun-shielded shaded area, inside a sun-shielded weatherproof deck box (aka deck storage box) about 48" in length, and both its intake air duct and hot air exhaust duct are well-wrapped in insulation (particularly the portions located inside the deck box), and the intake duct draws air at ground level from within a stack of cinder blocks located in a cool shaded area. Further, the 8 foot long cool air duct which carries the cold air from the cold air output port of the Mark 2 to a vent located at a height of 8 feet on the wall of the dome is also heavily insulated, both inside the deck box, and the 7.5-foot duct run traveling to the cold air vent port on the outer wall of the dome.
Oh, and I should mention that the top of the lid/cover on the deck box, along with the side facing south that might catch some rays of the sun near high noon, is insulated with two layers of reflective foil-bubble-foil insulation to help to keep the deck box interior relatively cool even on a hot sunny summer day.
A few additional notes that may be helpful to some readers:
Both of the ZERO BREEZE Mark 2 units that I own are the barebones air-conditioner-only models, that is, minus any batteries. I operate the ZB Mark 2 that is used to cool the above-mentioned meditation dome on AC power, and in case of a prolonged power outage of more than about 10-15 minutes, I have portable battery-powered back power stations available to power both items in the dome itself (i.e., lights, ventilation fans, and UFO beacon (a radio beacon to summon nearby UFOs/UAPs), etc.) and also to provide AC power for the ZERO BREEZE Mark 2.
Also, since the ZB Mark 2 draws input air for the cold air output port side of the unit (i.e., the front of the unit) from a large rectangular screened vent on the front side of the device, I also have a screened air intake vent installed near a lower rear corner of one sidewall of the deck box to draw air from the outdoors, and again, as I mentioned was the case with the intake air duct, this intake vent is shielded by cinder blocks sitting on the ground that are shielded from direct sunlight, to provide intake air that is as cool as possible.