The KoolAir Difference
One clogged strainer can ruin a perfect day on the water. KoolAir pumps are the only marine AC pumps built to handle it.
A Familiar Scenario
You are anchored in a quiet bay, the sun is high, and the cabin is comfortable. Below deck, your marine air conditioning is doing its job. Then the raw water strainer clogs. Barnacles, weed, sand. It happens to every boat eventually.
With a conventional pump, the next few minutes go badly. The pump runs dry, overheats, and the impeller warps. By the time you notice the cabin warming up, the pump has already melted. You are left with no AC, an unexpected repair bill, and a trip cut short.
With a KoolAir pump, the story is different.
What Happens with a KoolAir Pump
The strainer clogs and water stops flowing.
Same scenario. Same debris. Same blockage.
The KoolAir pump keeps running. For hours.
Heat-resistant materials and a sealless magnetic drive let the pump withstand the thermal overload that destroys conventional pumps.
The pump shuts down safely on its own.
No melting. No warping. No damage to any internal component.
Clear the strainer, let it cool, and restart.
The pump picks up right where it left off. No replacement parts needed, no technician, no lost time.
Why Boaters Choose KoolAir
There's more to it than run-dry protection.
Run-Dry Protection
A KoolAir pump runs for several hours with no water flow and shuts down safely. Clear the strainer, let it cool, and it restarts without damage. No other marine AC pump does this.
Lower Cost, Same Performance
KoolAir pumps are priced below comparable March pumps, and those don't include run-dry protection. Equal flow rates, interchangeable parts, and real protection when it counts.
Drop-In Replacement
Swap a March LC-3CP-MD for a KoolAir in minutes. Same mounting footprint, same port sizes. Or upgrade with a KoolAir Wet End Kit and keep your existing motor.
Two Bases Included
Every PM500 ships with a standard base and a marine base. March sells the alternate base separately. With KoolAir, you choose which fits your installation.
Trusted by Boat Owners
“While in Guatemala for hurricane season, AC pump started failing. Thank you for the extra effort to search the warehouse and find the last one! Arrived in a week and we are back to cool air!”
Marty Smith
November 2025
“We have been replacing the March air cooled for this model and has worked fine for the last 5 years. 3 pumps on board.”
Mariana Pezzulo
September 2020
“There are too many things that can go wrong when you're on the water, you need to mitigate risk and making the decision to implement a KoolAir pump helps me do just that.”
Jeff Rickels
Naples, FL
Ranked Among the Best Marine AC Pumps
The KoolAir PM500 was recognized as a top marine AC pump for its “powerful and steady flow rate, virtually silent operation, and doesn’t overheat easily.” It is available at a lower price than comparable pumps, and it's the only one with run-dry protection.
All KoolAir pumps are ETL Listed and UL recognized for marine safety · ISO 8846 Marine Ignition Protection · USCG Compliant · Manufactured by Manufacturers Edge, 40+ years in fluid handling.
Your AC Pump Shouldn't Be a Liability
KoolAir is the only marine AC pump with run-dry protection. Same flow rates as March, lower cost, and it won't melt on you.
Call (800) 810-1053 · Monday to Friday, 8:30 AM to 5:00 PM EST