Because laptops "seem weak" in many homes.
Portable air conditioners are very popular in Brazil because they are cheaper and don't require a fixed installation — but DECO warns that, in general, they are less efficient than split systems and require an exhaust pipe in the window , which can increase energy losses.
1) Single pipe vs. double pipe: which cools better?
A) Single -hose laptop
It works by expelling hot air through a tube. The critical point: when expelling air, it can create negative pressure , and the house "pulls" hot air through cracks/doors/windows — meaning the device ends up working harder to compensate. Manufacturers and testing entities describe this effect as one of the reasons for poorer performance in many laptops.
B) Dual -hose laptop
It uses one tube for air intake and another for exhaust, helping to reduce the problem of negative pressure and improving cooling in challenging scenarios (larger rooms, more heat). Technical explanations from manufacturers show that the dual-hose design tends to better maintain the air balance in the space.
Rule of thumb (for your end customer):
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Small room / occasional use → a single tube may suffice (if properly sealed)
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Larger room / heat waves / lots of sun exposure → double tube lighting is preferred.
2) Installing it in the window is only half the battle (really!)
DECO says that the notebook requires the installation of the conduit in the window, and this can increase energy losses.
So, to "gain" efficiency:
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Seal the window with a kit/plate/adapter and foam (prevent hot air from entering).
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Keep the pipe as short and straight as possible (less loss).
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Avoid opening doors onto hallways (they draw in hot air and ruin the appliance's performance).
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Close blinds/curtains during the sunniest hours (reduces heat load).
3) Power (BTU) and "actual size" for laptop
To avoid the mistake of buying "too much BTU" based solely on the number, he reminds us that testing methods can vary between markets; the most important thing is to follow recommendations per square meter and environmental conditions (sunlight, windows, insulation). DECO has power guides and reminds us that these conditions change the actual need.
4) Quick checklist for buying a "good" laptop
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✅ Duct in the window (mandatory; without it, it's not a "real" air conditioner)
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✅ Noise (dB) : Consider bedroom/office
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✅ Dehumidification mode (very helpful in humid areas)
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✅ Drain (manual/continuous) if used for dehumidification.
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✅ Double piping preferred if the installation is demanding.
FAQ
Does a portable air conditioner consume a lot of energy?
It depends on power consumption, hours of operation, and losses at the window; proper sealing reduces waste. DECO warns about energy losses due to the pipe at the window.
Is a double pipe better than a single pipe?
In many cases, yes, by reducing negative pressure and improving cooling.
Can I use a laptop without a tube?
If there is no evacuation of hot air to the outside, it is not an effective "compressor" air conditioner (it is usually an "overhead refrigerator"). DECO reinforces the need for the duct.