Whynter - ARC-14SH

Recently had success in my attic with the “Whynter Portable Air Conditioner 14,000 BTU & Heater with Dual Hose”. It cools about 500 sqft no prob

You’re not doing anything wrong..portable ACs are mold traps by design. Sitting all winter with leftover moisture = fungus party. Run it on fan mode before storage to dry it out. As for brands, try Whynter or Midea dual-hose. They’re slightly easier to clean. Or go mini split and never look back.

If you have the money, buy a dual hose Whynter portable AC. Otherwise - the design and construction of single hose units is such that you won’t be able to get it to not pull vacuum, even by adding a second hose to provide it with outside air. There will be leakage inside the unit itself that will prevent you from getting a perfect loop from outside to outside. But that’s still going to be much more effective than running it with the stock single hose, so it’s worth doing, and will be your best short term solution if money is tight.

Realize this thread is old. OP, any update here? I'm having the same problem and it's driving me crazy.

I’ve owned multiple portable A/C units and have never had to drain them curious why Whynter is different.

I did this while using the heat mode and it still shut off every hour because the tank was full .

So which hose did you cap the intake or the outflow ?

If you’re going portable, go LG or Whynter. Midea’s hit-or-miss like a Tinder date..looks good online, but disappoints in person.

Whynter ARC-1230 or ARC-14S Dual hose and 14,000 glorious BTUs. Not cheap but they're the best of the best.

Or a dual hose, i recently bought a whynter 14000btu and it will cool most of the top floor of our house. With single hoses pumping out air inside the home it builds negative pressure so everytime you open a door to the outside it will suck in all the outdoor air (also leaks in through other spots in the house)

Yes, is the space insulated? First question to answer. Does it have windows? And which way do they face (aouth, etc)? We have a large 14000btu whynter portable ac in the garage. Its fully insulated and no windows. Works well to keep the space below 80 and around 50% humidity on most days. With that said, If i had the cash and space, a mini Split would be the way to go.