Hose systems are vented to the outside via air ducts. The “Monoblock” version collects the water in a bucket or a tray, the pump will stop once full. The air to air version re-evaporates the water and discharges it through the duct hose, this can then run continuously.A single-duct unit draws air out of the room to cool its condenser; it will then vent it out of the room. This air is reimbursed by hot air from outside or alternate rooms. Thus reducing the efficiency of the air conditioning unit. Modern units typically run on a 1:3 ratio, for example to produce 3kW of cooling this will only use 1kW of electricity. A dual-duct unit draws air from outside to cool its condenser instead of from inside the room, This is more efficient than most single-duct units. Here we recommend 25m2 can be cooled by 12,000BTU/h, 40m2 can be cooled by 18,000BTU/h etc. This is not a set rule, other factors will affect the total heat load, for example a conservatory will need a higher powered system due to glass having a low insulation factor.
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