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To this day, I still don't understand single-hose air conditioners.
With a dual-hose air conditioner, it draws outside air in (through a hose) to transfer the heat to and blow back outside (through another hose). This way, it works much like a conventional air conditioner, keeping the hot and cold parts totally separate.
But with a single-hose unit like this, the a/c draws in cool room air to transfer the exhaust heat to, which then gets blown outside (through the hose). The same air the unit just spent a bunch of energy cooling gets heated and blown back outside. This means warm outside air has to work its way in someplace else to replace it, making the whole endeavor terribly inefficient.
But, dual-hose air conditioners cost twice as much as single-hose units. Can they really be that much more expensive to design and build? Or is it all a big con to sell tons of cheap inefficient air conditioners, and drive up the price of the ones that actually work well?
I don't get it.
(I overuse parentheses.)
quality posts: 7
stepharlo wrote:I'm considering this for my basement, which doesn't get crazy hot given its mostly underground location. But I am in Tennessee, and a/c is still occasionally needed to keep it comfortable down there. As it is a basement, a dehumidifier is a must. I love the idea of combining the two units into one. What I'm wondering is, can it do both functions at once? Or does it either cool or dehumidify? And since there is no holding tank, does the moisture removed just drip out the window and down the side of my house?
The manual says that dehumidifier mode increases room temp., so it's one or the other.
Technically, the glass is always full.
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khammo01 wrote:That's not quite how it works. The unit has two fans and two air circulation zones.
Fan 1: The first fan takes room air, passes over the evaporator and then recirculates it back into the room.
Fan 2: The exhaust hose takes air from the room, blows it over the compressor and condenser, and exhausts that hot air. As air is exhausted from your house, it creates negative pressure, so it is drawing in more warm air from the outside through the various cracks in your house.
This is not as efficient as a window unit, which uses outside air to cool the compressor and condenser, which means air is not getting sucked in to your house.
Yeah, that's exactly what I said. This air conditioner literally blows nice cool room air out the window (after transferring the waste heat to it), causing hot outside air to work its way in through whatever openings it can find. I find it entirely unsurprising that folks complain about these things not working well.
I wonder, if I bought one, could I dismantle it and convert it to a two-hose design? I'm sure it wouldn't be pretty (to say nothing of the warranty), but I can do a lot of interesting things with two-by-fours, styrofoam sheeting and foil tape.
(I overuse parentheses.)
quality posts: 56
stepharlo wrote:...can it do both functions at once? Or does it either cool or dehumidify?
An air conditioner always both cools and dehumidifies.
That's why window units drip water outside: the water is extracted (dehumidified) from the inside air. This one uses the hot air being exhausted to evaporate the water and carry it out as vapor.
Mechanically, a dehumidifier is exactly the same as an air conditioner. The only difference: after the room air is cooled and dehumidified by passing through the evaporator (cold) coil, it then goes through the condenser (hot) coil (that's outside in a window A/C unit). The resulting air is slightly warmer, and dehumidified.
Why is it warmer? The thing is not 100% efficient. Whatever power it uses to run the compressor and fan is converted to heat, just like every other appliance in your house (whose rear end isn't sticking out a window): if your TV uses 150 watts, that's 1/10th of a space heater's worth of heat that it produces constantly.
I'm supposed to buy something? But we're having so much fun with things as they are, I don't want to ruin it!
Purchases: 18 / 11 (nobody cares what, so I won't tell you);
Brownies of Cannabis: 1 / 12 (Thanks, Wootalyzer! -- would it help if I called them something else?).