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Model # ASA51

Internet # 100662181

MasterCool 5000 CFM Side-Draft Roof 8 in. Media Evaporative Cooler for 1650 sq. ft. (Motor Not Included)

This item has been discontinued.
The Home Depot no longer carries this specific product.

$625.00 /each

  • Designed to work in dry/arid climates
  • Is not an air conditioner
  • High quality components at low costs




Model # ASA51

Internet # 100662181

This MasterCool down-discharge evaporative cooler is provide an economical, environmentally-friendly means of cooling up to 1,650 sq. ft. Engineered for maximum airflow and superior durability, the MasterCool line of coolers not only save energy dollars, but provides years of worry-free cooling comfort for you and your family. This unit can accommodate a 1/3, 1/2 or 3/4 HP motor (sold separately) based on your cooling needs. This evaporative cooler performs best in dry, arid climates.

  • Side discharge design
  • Circulates air at up to 5,500 CFM based on motor speed
  • Cools up to 1,650 sq. ft. for whole-house cooling
  • Designed for use with 1/3, 1/2 or 3/4 HP motor (sold separately)
  • Uses high performance 8 in. rigid media
  • Easy connect to water supply for continuous operation
  • Unique perforated air inlet screen provides more air flow than the competition
  • Galvanized-steel cabinet provides durability
  • Tough, polyester-resin coating on exterior surfaces
  • Blower wheel designed for quiet operation
  • UL classified for safe operation
  • Evaporative cooler performs best in dry, arid climates
  • Made in Denison, TX

Info & Guides

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Cooling zone (sq. ft.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Air Volume (CFM) 
Amperage (amps) 
Built-in HEPA filter 
Built-in carbon filter 
Cool Sand 
Color Family 
Beige / Cream 
Commercial / Residential 
Commercial / Residential 
Discharge direction 
Evaporative Cooler Product Type 
Roof/Wall Cooler 
Maximum compatible motor horsepower (hp) 
Motor Included 
Product Weight (lb.) 
163 lb 
Single or dual inlet 
Single inlet 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
3-UL Classified 
Manufacturer Warranty 
1-yr limited warranty on cabinet against leakage due to rust out/limited lifetime warranty on water reservoir/5-yr limited warranty on media/1-yr limited warranty on parts 


Rated 4.5 out of 5 by 10 reviewers.
Rated 4.0 out of 5.0 by Cooler purchase The product is good but when we removed it from the box to put it on the roof, it had several dents in it. September 8, 2015
Rated 3.0 out of 5.0 by Bitter sweet... Though I have had good luck w/ Home Depot in the past I wasn't so lucky with this one. I purchased it because it had free shipping - for a 200 pound piece of equipment that is a plus. However it arrived dented in three different places. On top of that since I had a used 3/4 hp motor all I needed was the pulley and the one recommended for this unit had the wrong bore shaft. Other than that it works great just looks like it has been around the block. I guess I could have refused shipment but what would you do if you lived in Arizona in June? May 30, 2011
Rated 5.0 out of 5.0 by Good Buy This cooler works great. I've had it installed for about two months now with no problems, absolutely no leaks, and very good operation. The only negative comments I have are: the sheet metal is somewhat flimsy, so you have to be careful when you remove the inspection panels not to bend them; a couple of sheet metal screws were over-tightened at the factory and the threads were stripped as a result; the filter media added a mild but odd odor to the air for the first week or so of operation. I would abolutely buy this cooler again and I would recommend it to a friend. Strangely, it was much cheaper to buy the bare unit and purchase the motor, pulley, and purge pump separately rather than buying a complete assembled unit. August 28, 2012
Rated 4.0 out of 5.0 by Only the best for my tenants... As a home owner, we have a single rigid media pad unit (AeroCool Pro) on our home. It is VASTLY better than a standard 3-sided evap cooler. It's lasted 15 yrs. now, with very minimal rust and corrosion evident. As a property owner, when it came time to replace a tenant's standard 3-sided evap. cooler (which hasn't lasted anywhere near as long and was completely rusted out), when I discovered a 3-sided unit and this one were only about $125 difference, I decided, if we COULD mount if to the side of the building, we WOULD install it. Needless to say, our tenants are completely happy. And, therefore, so are we. Please note, this unit is a standard residential unit and, thus, does not have a 2nd pump (purge) option, which our AeroCool Pro (The AeroCool Trophy series is the same as this unit) does. But this model does have a higher version, which is the same as our AeroCool Pro. If you can afford it, buy that one. The reason for less than 5 stars, is because there were some dings and paint damage to the unit upon delivery. July 14, 2015
Rated 5.0 out of 5.0 by Simply The Best I ordered this online for pickup at my local store. I had the same model on my Phoenix house for 18 years before the cabinet rusted through and needed replacement, so this one was easy to just put up in its place. The pads last for years at a shot, so you eventually save money over Aspen pad models. The sections (wet section and blower cabinet) are able to be separated for ease of transport and I was able to get the entire thing in the back of my SUV. All in all a very high quality unit. May 8, 2012
Rated 5.0 out of 5.0 by Awesome Cooler This the third mastercool unit I've owned for different houses. The air feels much like AC in that it's cold like AC but not overly humid like your typical swamp cooler. Even during the humid monsoon season this unit gets us through quite comfortably! I've got mine connected to a thermostat and couldn't be happier!! May 27, 2012
Rated 5.0 out of 5.0 by Much better than the old unit . This unit is designed much better than the previous mastercool cooler I had. The thermoplastic wet section should last much longer than the original unit . March 18, 2014
Rated 4.0 out of 5.0 by Works exacly as needed. Overall the cooler was pretty simple to install. Once I figured out how to take it apart, that is. Keeps my green house at the temperature where I need it. The installation instructions around the motor/pulley were a bit on the vague side for someone who does not deal with this type of equipment. But, I was able to work around the issues encountered. Over all the unit works well, time will tell how long it will last. October 19, 2012
  • 2015-11-25 T11:23:18.715-06:00
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