You will not only be protecting your home with annual equipment inspections but you'll also receive several other discounted and priority services. All portable AC units are made with ducting of about the same diameter - 5 inches. The heating efficiency of a unit is measured using a coefficient performance (COP). Make sure you choose the right one for the size room you are trying to cool. Dual-hose portable AC units usually cost more than regular models. Some people may not like these because they are not as energy-efficient as their split counterparts. You will install the window AC unit and leave it in that room. It was also louder that we'd hoped, and occasionally it made a high-pitched sound like a bug zapper. Some units can cover a larger area with more power. It is not suitable for large rooms, or climates with high temperatures. You may not be able to install an HVAC system due to lack of time, budget, or capacity. Honeywell MO08CESWK6 is a great single-hose portable AC that can provide spot cooling for areas up to 350 square meters. You can't run ductwork to it because of the possibility of carbon monoxide poisoning. If you want to cool a space between 10m2 and 20m2, you'll need a unit that ranges between 1000 and 2000, depending on how well your home is insulated. It's also much easier to install an AC that stands on the floor, since you won't have to disturb the structure of your home.