Big Ass Fans Cool-Space 400 Review: Workshop Cooling for 3,600 Sq Ft
The Big Ass Fans Cool-Space 400 cools workshops and garages up to 3,600 sq ft with a 36 inch fan, up to 9,700 CFM and a 46 gallon tank.
By Daniel Brooks
Updated October 29, 2026
The Big Ass Fans Cool-Space 400 Evaporative Cooler is a commercial evaporative cooler for workshops, garages and studios up to 3,600 sq ft, with a 36 inch fan, up to 9,700 CFM and a 46 gallon tank. For more models, see our Evaporative Air Coolers page.
Our Verdict
The Cool-Space 400 is built for serious work spaces. Its airflow, treated media and long tank run time make it a strong choice for shops that run all day.
Its price and size put it out of reach for homes, and it needs a large, open, dry space to perform as rated.
Big Ass Fans Cool-Space 400 Evaporative Cooler
As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated.
Key Specifications
| Feature | Specification |
|---|---|
| Brand | Big Ass Fans |
| Model | Cool-Space 400 |
| Coverage | up to 3,600 sq ft |
| Fan | 36 inch, 6,400 to 9,700 CFM |
| Tank | 46 gallons, up to 10 hours, or hose |
| Media | 8 inch resin-coated |
| Safety | automatic low-water shutoff |
| Mobility | locking swivel casters |
Design
The 36 inch fan moves between 6,400 and 9,700 CFM, and Big Ass Fans says it can cool air by up to 33 degrees depending on ambient conditions.
Its 8 inch thick cooling media is chemically treated and coated in a thermosetting resin, which resists algae, survives frequent cleaning and keeps dirt out.
Controls
Variable-speed controls let you set the airflow, and the direct-drive motors run very quietly for their size.
The 46 gallon tank runs up to 10 hours without a water connection, or you can connect a standard garden hose. Automatic low-water shutoff, locking swivel casters and an easy drain plug are standard.
Placement Tips
Place the cooler near an open window or door, or with a window cracked on the far side of the room, so dry air can come in and humid air can escape. Aim the airflow at where you sit, sleep or work rather than into a corner.
Evaporative coolers work best in hot, dry weather. On humid days, switch off the pump or water mode and run the fan alone, since adding more moisture to damp air makes a room feel sticky rather than cooler.
Running Costs and Care
An evaporative cooler draws far less power than an air conditioner, so running costs are low. Budget for water and an occasional replacement pad instead of a big electricity bill.
Drain and rinse the tank regularly so water does not sit stale, and clean or replace the cooling pad as the maker recommends. Before storing the cooler for winter, run the fan without water so the pad dries completely and does not grow mildew.
How It Compares
Against the Portacool APEX 2000, the Cool-Space 400 is rated for a larger area, while the Portacool adds Wi-Fi and digital controls.
Against the Hessaire MC92V, the Cool-Space 400 has more durable media and indoor-rated coverage, while the Hessaire moves more air for less money outdoors.
Pros and Cons
| Pros | Cons |
|---|---|
| Up to 3,600 sq ft | Very expensive |
| Up to 9,700 CFM | Large and heavy |
| Resin-coated 8 inch media | No Wi-Fi |
| Up to 10 hours per tank | Not for homes |
| Low-water shutoff | Needs dry air |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Workshops | Homes |
| Garages | Bedrooms |
| Studios | Humid regions |
| Warehouses | Small budgets |
For more options, see our picks for the best commercial evaporative coolers and the best evaporative coolers for garages.
Final Verdict
The Big Ass Fans Cool-Space 400 Evaporative Cooler is a heavy-duty commercial cooler with durable media and long run times for large work spaces. You can check the current price and details for the Big Ass Fans Cool-Space 400 Evaporative Cooler.
Frequently Asked Questions
How much space does the Cool-Space 400 cool?
Up to 3,600 sq ft.
What is its airflow?
Between 6,400 and 9,700 CFM.
How big is the tank?
46 gallons, for up to 10 hours without a hose.
Can it connect to a hose?
Yes, a standard garden hose.
Does it shut off when the water runs out?
Yes, it has automatic low-water shutoff.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.