Questions on Efficient & Proper Use of a Residential Central A/C

• posted on July 27, 2007, 4:47 pm
I recently have installed a Lennox XC15 and was wondering whether I should have the A/C constantly going even when nobody's home during the day or have it not come on until shortly before we get home from work?
I currently have the thermostat programmed so that the A/C will not come on after we leave for work and have it come back on to start cooling down the house shortly before we come back from work.
But what I noticed on my couple of days off from work is that during the day when it's not programmed to come on at all and is hot out, my house can reach as high as 30C/86F inside. Then when it came time to cool down the house, the A/C was going for quite a while before it brought the indoor temperature down to 24C/75F which is what we're comfortable at.
So, what I was wondering was, which would be a more efficient and less taxing use of the A/C?
1. Have the A/C not come on during the day at all after we leave for work until we come home, no matter how hot it gets inside, thereby having the A/C run for quite a while before the indoor temperature is brought down to 24C/75F.
2. Do have the A/C keep the house cool, but just not at 24C/75F, which is what we normally have the house at. But a little warmer while nobody's home, say 26C/78.8F. And then have the A/C cool down the house to our comfortable 24C/75F by the time we get home from work.
3. Have the A/C running all the time to keep the house at the 24C/75F level whether nobody's home or not.
FYI, I believe my A/C has a SEER rating of 15 or so. How do you guys have your A/C programmed? Thanks.
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• posted on July 27, 2007, 5:02 pm

#1 if your unit is grossly oversized
#2 if your unit is properly sized
#3 if your unit is undersized
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• posted on July 27, 2007, 7:19 pm

What in hell got anything to do with his question oversize, undersize, properly size. he is looking for comfort and not if system is properly matched. you call yourself pro.???????
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• posted on July 27, 2007, 7:31 pm

Learn to read. The OP asked "which would be more efficient", not "which would be more comfortable". KJ's answer was the appropriate one.
LLoyd
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• posted on July 28, 2007, 4:57 pm

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• posted on July 28, 2007, 2:20 am

Hey, Fuckhead... First, you have to understand the original posters question. Second, you have to understand how a HVAC system operates. Third, you have to understand heat gain.
Those are some of the items you need to know. Along with *common sense* (which you obviously don't have), then you could figure out a competent answer. I would explain it to you... but it would be a lost cause, as some people are just un-trainable. You and Stormy have this level of incompetence.
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• posted on July 28, 2007, 2:43 am

dildo sat that.
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• posted on July 27, 2007, 9:52 pm
No Way wrote:

#1
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• posted on July 27, 2007, 9:56 pm

Dude, You're sounding a little cheap to me. It's A/C. Its a luxury (even though most people think it's not). They take energy to run and energy costs money. If you want the house cool when you get home then leave the temperature at that setting. If you would like it hot when you get home and not cool of till maybe 1am in the morning then turn it up to 85 or 90 while you are at work and have it start running again at 5pm. Oh, here is one more tid bit for you to feed on. The higher the temp and humidity in your house gets the harder your compressor has to work. A lot of times the temp outside and inside is so warm that there is hardly and cool suction gas left to cool your compressor. So, it runs hotter longer and drastically puts a whippin on the ocmpressor. If you want it cool you gotta pay for it. If you want to save money, turn it off! Bubba
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• posted on July 28, 2007, 3:36 am
Actually, running the air conditioning during the evening hours' costs less than during the day.
So, running the air conditioning set to a higher temperature during the day WILL save \$\$\$\$. As long as the doors and windows are shut, shades are down, the air conditioning will maintain the higher temperature setting, and keep the humidity somewhat reasonable. Resetting before coming home using a programmable thermostat is good practice. That way, by the time you do get home from work, the target temperature will be met or close to it. Particularly if you use a thermostat that has a "adaptive recovery" feature such as Honeywell thermostats.
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Zyp
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