Air Conditioning - Window A/c Unit
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madhouse
10-19-04, 05:54 PM
HI:
I have a window a/c unit with a remote control. I have a house where 2/3 has vaulted ceiling and rest has 8 foot ceilings. I would like to place the unit in the vertical part of wall where the vaulted meets the 8 foot. The question I have is the attic too hot for the A/C to function properly.If so what would be reuired to make this work. This would be a great place to cool my home. I have no ducting in my house. Electric baseboard heat and wood stoves. Has this ever been done before and what were the outcomes and challenges.
I have a window a/c unit with a remote control. I have a house where 2/3 has vaulted ceiling and rest has 8 foot ceilings. I would like to place the unit in the vertical part of wall where the vaulted meets the 8 foot. The question I have is the attic too hot for the A/C to function properly.If so what would be reuired to make this work. This would be a great place to cool my home. I have no ducting in my house. Electric baseboard heat and wood stoves. Has this ever been done before and what were the outcomes and challenges.
hvac4u
10-20-04, 02:44 PM
if you mean that the portion of the unit that usually is outside being vented to your attic, i would not do it. attic temps will have it running a very high head pressure.
even with a good attic ventilator, the air going across the coil will be much higher than outdoor ambient temp and cause problems.
even with a good attic ventilator, the air going across the coil will be much higher than outdoor ambient temp and cause problems.
Ed Imeduc
10-20-04, 02:50 PM
With hvac4u Just dont do it it wont work .
ED :eek:
ED :eek:
Spoonfed
11-13-04, 08:08 AM
I have done/tried this (yeah yeah, stupid i know)
It has not been overly sucessful, though i think more so due to a poor quality unit (LG 6.1kw)
While my roof space is not what u'd call an "attic" as such, more just a ceiling cavity it does not get more than about 2-3degC (5deg f approx) hotter than outside.
This is such as the tiled roof has near while insulation mebrane paint, heat reflective which has dropped in ceiling (and helped in side) temps massively
(previously they where about 15degC (25 f approx) more than out side)
Oh also fan ventelation helps too.
It is a "poor" location, however i figure if temps are only marginally hotter than outside it "should" perform similarly?
The LG unit seem to perform very poorly in that the "coldness" of air output form the front even when the rear of the unit is operating in say 32deg C temps (89degF) it is only pumping 19.5degC (67degF) air out the cold side.
when the rear of the unit is 20deg C or less (68degF) it may drop to to ouput cold air of 11 or just under Deg C
It seems inferior to other brands (such as panasonic) in this regard, and hold this as the main performance issue more so than what is porbably only a minor compromise installation. (i also have another LG in a window mounting (ie regular) and it also is poor in this regard)
What i have done to try and help things is the rear of the "hot exhaust" has a 400mm (16inch) duct out a roof vent. And the largest "grilled" intake side (on the back of unit bit) has 400mm duct feeding air using exhaust fan.
Either way performace is the same..... poor. I think i will have to abandon the idea, waste the $'s now spent, and just get a decent split system, definately not LG thats for sure.
It has not been overly sucessful, though i think more so due to a poor quality unit (LG 6.1kw)
While my roof space is not what u'd call an "attic" as such, more just a ceiling cavity it does not get more than about 2-3degC (5deg f approx) hotter than outside.
This is such as the tiled roof has near while insulation mebrane paint, heat reflective which has dropped in ceiling (and helped in side) temps massively
(previously they where about 15degC (25 f approx) more than out side)
Oh also fan ventelation helps too.
It is a "poor" location, however i figure if temps are only marginally hotter than outside it "should" perform similarly?
The LG unit seem to perform very poorly in that the "coldness" of air output form the front even when the rear of the unit is operating in say 32deg C temps (89degF) it is only pumping 19.5degC (67degF) air out the cold side.
when the rear of the unit is 20deg C or less (68degF) it may drop to to ouput cold air of 11 or just under Deg C
It seems inferior to other brands (such as panasonic) in this regard, and hold this as the main performance issue more so than what is porbably only a minor compromise installation. (i also have another LG in a window mounting (ie regular) and it also is poor in this regard)
What i have done to try and help things is the rear of the "hot exhaust" has a 400mm (16inch) duct out a roof vent. And the largest "grilled" intake side (on the back of unit bit) has 400mm duct feeding air using exhaust fan.
Either way performace is the same..... poor. I think i will have to abandon the idea, waste the $'s now spent, and just get a decent split system, definately not LG thats for sure.