10,000 BTU (SACC) / 14,000 BTU (ASHRAE) DUAL Inverter Smart Wi-Fi Portable Air Conditioner (LP1419IVSM)

https://www.lg.com/br/ar-condicionado-residencial/ar-condicionado-portatil/lp1419ivsm/?region_id=NSS&utm_source=google&utm_medium=cpc&utm_campaign=HQ-HS/ES-D2C_ES_RAC_BR_25_NA_Assembly_All-PT-RAC_lg.com_purchase_NA_google-ads_PMAX_OTH_tROAS_PUR_AO&gclsrc=aw.ds&gad_source=1&gad_campaignid=19951713801&gclid=Cj0KCQjwmYzIBhC6ARIsAHA3IkT9ADcwQS9lHQh4E2CBbM0gdEIcV2au0MBoo-a1uQbM_Wo0-T-n2CYaAtafEALw_wcB This is the strongest portable Aircon you can buy in Brazil, I use it for a 18 sqm bedroom and it works really well.

LG 14,000 or a Honeywell will cool off an entire place without raising electric bill

I have an LG model and it is awesome. I use it in a bedroom in my home in Nicaragua. It uses a dual inverter technology- nothing better. https://preview.redd.it/25mjl9776p8f1.jpeg?width=3024&format=pjpg&auto=webp&s=e3be69cc6746158258082e62a2d13024a8fbe138 Keeps up splendidly with our humidity. This model is the best made currently in the world. I bought it in Nicaragua but it is available in the US…It is heavy and built beautifully. This would work in an RV

And mine is run with a completely sealed room..door kept closed…and it stays cold

if you don't mind the price, search the LG 14,000 BTU portable AC. I've had two, and both were great. I mean, great. My apartment has a condition where it stores all of the city's hot air, and internally reaches 97 degrees come august/september. This unit churns out a cool room in an hour or 2 starting with that high temp, and my 20 ft ceilings. If you have a better starting place than that, chances are it will turn any room you have into an icebox.

I have two LG AC units. One is in the window of my main shared space and would fall onto the balcony if it fell out the window. It's a 14k BTU unit. It works very well. I also have a portable double inverter unit at 12k BTU inside our bedroom and it's got a hose that blows out the window and we've had to lock down the window portion around the hose. The hose is also supposed to be sticking outside a bit, like an inch past the window so it ensures ventilation of hot air outwards and away. This unit is fantastic and cools down the bedroom to a chill. I cannot have a window unit in the bedroom as it can fall outwards and so only a portable is permitted in rooms with windows that do not fall onto balconies.

Same unit. It's louder than I'd like but it does the job in our bedroom with minimal fuss. Have a similar dual hose unit from LG in the main room and it doesn't cool the entire space, but can certainly reduce the temp by 3-4 degrees and take the edge off. If you can't get a window unit, you're not SOL anymore.

A dúvida é de facto conseguir algo a baixo custo e mesmo eficaz. Eu já passei por esse dilema e a melhor solução que encontrei foi com AC Portátil LG Dual Inverter 11000 btu's, classe A+, com kit de janela que por acaso até é bem prático. O negativo é o que por exemplo, já tive meses em que esteve praticamente ligado o mês inteiro... E a conta da luz no fim quase duplicou. Mas fica a casa inteira com uma temperatura de 22 a 24°C. Até ter esta solução, gastei mais de 250€ em ventoinhas, colunas de ar, purificadores, etc.. Agora estão todos arrumados.