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Old 05-25-2010, 10:06 AM   #1
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year old american standard 3 ton two stage with variable speed air handler-house has great insulaton with tripple pane windows-two story 1800sf. Question- Should copper tube( no insulation) be hot, warm or what temp as it enters outside unit? With an outside temp of 80 F the outside unit is running almost non stop to maintain interior at 69F

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Old 05-25-2010, 10:19 AM   #2
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The small line should be luke warm but there is NO rule of thumb anymore with the higher SEER units. Big line should be cool under the insulation. I would get it checked to make sure the freon level is okay and use the installer as it should have a parts warranty. Low freon level will cause you a large $$ electric bill and can damage the unit. Should be checked once a year.

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Old 05-25-2010, 01:42 PM   #3
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Its 2 stage. Its suppose to run for long long periods of time.

The small line may not feel warm at all when its 80 outside, depending what your indoor temp is.
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Old 05-26-2010, 11:24 AM   #4
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I thought that a two stage was to save electricity-but if it runs longer than single stage-??Please explain
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Old 05-26-2010, 11:38 AM   #5
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They run at a lower/slower speed of motor which uses less energy but run longer. They longer it runs the more humidity it removes and allows you to keep the temp higher and feel comfortable which saves $$. It also is quieter and more comfortable and does not blast cold air at you as hard. On cooler days it matches the load better. Starting and stopping is inefficient and hard on machinery. Kinda like the new car engines V8 when needed on the highway but drops 2-4 cylinders for city use.
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Last edited by yuri; 05-26-2010 at 11:45 AM.
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Old 05-26-2010, 11:50 AM   #6
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As Yuri said. Its running at a reduced capacity. So it uses less electric per hour that it runs. Then it does in second stage.

2 stage is for comfort though. Not to save you a lot on your electric bill. A 16 SEER single stage uses as much electric as a 2 stage 16 SEER.

But, if it reduces the indoor humidity enough. You use a little less electric by being able to have your thermostat set higher. And still feel as comfortable as you did at the lower temp setting.

A 2 stage running in first stage. Might only use 55% as much electric an hour as a single stage would cycling on and off for an hour.

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