Drawing outside air w/fan on?


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Old 10-01-05, 08:06 AM
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Drawing outside air w/fan on?

I live in Phoenix where the day temp can be over 100 but can fall to the 60s at night. Is there a way to draw in that cool outside air at night using the heat pump (it's a 1996 Trane, model WCC048). I've tried turning off the air conditioning (on the thermostat) and setting the fan to "on," but that appears to just recirculate the inside air. Any suggestions?
Thanks!
 
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Old 10-01-05, 09:41 AM
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your air conditioning system is essentially a "closed loop" taking air from inside your home, conditioning it (heating/cooling/dehumidifying), and putting it back in your home.

You need an attic fan and a couple of open windows to draw in the cool night air..
 
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Old 10-01-05, 09:48 AM
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A heat pump dosnt bring any outside air inside.
If you want the cool outside air to come inside....open a window at one end of the house, and a windoe at the other end of the house, then place a fan between the two.
Seriously tho, possibly a heat exchanger will do what you want...but I dont.
More to your question, your heat pump uses two condensers, on inside and one outside, connected by pipes that hole a compressed gas. The compressor (on the outside) moves the gas through the coils to either cool or heat them. and your fam blows accross the coils and out your vents to either cool or heat a room.
 
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Old 10-01-05, 09:55 AM
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Attic fan

Thanks for the reply.

Wouldn't an attic fan just suck air from the screened attic gables? I've heard of "whole house attic exhaust fans." Is that what I'd need?

We'll need a new heat pump soon anyway (the 1996 Trane has a SEER rating of 10 -- when it was new!). Are there units that can be set to draw in cool air at night and then revert to the closed loop set up when air conditioning during the day?
 
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Old 10-01-05, 10:53 AM
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Not that I'm aware of... as I said, an A/C system is a "closed loop" system, designed to condition the air inside the house.

An attic fan will draw air from the house interior into the attic - discharging it through the gables.... I've had a few of them over the years and love em. I can recycle the air in the entire house in just a few moments with open windows and the fan on.
 
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Old 10-01-05, 11:05 AM
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Where does your attic fan vent from and to? I was thinking of putting one in the roof; is that the kind you have?
 
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Old 10-01-05, 05:46 PM
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a "whole house attic fan" typically installs in a relatively unobtrusive place like a hallway or stair landing. I've had them in both areas. It fits in the ceiling of the house and is covered by louvers that automatically "raise up" by air pressure when the fan is turned on. It pulls air from the house and pushes it into the attic... then out the gable/soffit vents. When you open windows in the house and turn it on - it can actually create a breeze through the rooms with open windows.....

You're thinking of attic vents/turbines that install on the roof to pull hot air out of the attic.... not the same animal...
 
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Old 10-01-05, 06:03 PM
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Thanks! That sounds like what we need! I'll check it out.
 
 

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