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Old 08-23-2007, 06:02 PM
 
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I have 2 bedrooms that no one uses. If I close the vent and shut the door is that going to help my A/C not run so much or does it make a difference.

I know it is going to run a lot right now since we have had temps in 100s for the last 2 weeks.
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Old 08-23-2007, 08:07 PM
 
Location: Northeastern WI
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It wont really make much difference but out here, there are many who just dont use their hot water heaters, and turn the breaker off. That might help in the 'electricity usage' part. They have it run maybe a couple of hours in the morning, and because the water lines go through the attics, it comes out hot all day long. Sometimes the hot water in the cold water lines could be a problem though, if you need to use cold water for laundry, lol.
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Old 08-23-2007, 08:35 PM
 
Location: Las Vegas
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I don't think it makes a lot of difference. But beware that the humidity doesn't get too high in those rooms or you could encourage mold growth. Mold abatement is a lot more expensive than electricity!
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Old 08-23-2007, 08:37 PM
NCN
 
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When the electrician put in our heat pump/central air, he told me not to close off too many doors. It ruins the efficiency of the unit? Our children like their bedroom doors closed when they come to visit. They complain that their rooms are too hot/cold according to the season. I tell them if they want to be more comfortable to open the doors. You can probably test to see if you save electricity. Check with the manufacturer or the electric company. They really know about these things.
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Old 08-23-2007, 08:52 PM
 
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Thermostats are usually located to get the best air flow. When you close off vents, this forces that extra air into the other vents. This will make those rooms too cool before the air flows to the thermostat. It may be that your house is arranged so that it would work OK, but chances are that it won't.

The mold problem could be a real pain if it got started.
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Old 08-23-2007, 10:05 PM
 
61 posts, read 127,797 times
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Quote:
Originally Posted by Padgett2 View Post
Thermostats are usually located to get the best air flow. When you close off vents, this forces that extra air into the other vents. This will make those rooms too cool before the air flows to the thermostat. It may be that your house is arranged so that it would work OK, but chances are that it won't.

The mold problem could be a real pain if it got started.
If I may elaborate on your very good point, I would like to point out that A/C units are installed and callibrated for the size of house. Closing off certain rooms probably would not have an adverse effect and closing off just the vents (as long as some air comes through) may not be a bad thing. Additions to a homes size could be bad since the A/C would have to work harder. But anyway, I had to shut vents to a room that was the closest to the air handler closet, it was mighty chilly in there; the room farthest away didn't get enough air - so this way it seemed to even out and it's been at least two years and no A/C problems. But doing it to save money I'm not sure about. Lowering the temperature is the only way I know of saving money on the A/C. Also, here in Fla our A/Cs have dehumidifiers working in unison, taking that moisture out is key to comfort and efficiency. Also - if your A/C unit is older it may not be as efficient as the newer ones. It does cost a lot to upgrade though.
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Old 08-23-2007, 10:14 PM
 
61 posts, read 127,797 times
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Quote:
Originally Posted by Keeper View Post
I have 2 bedrooms that no one uses. If I close the vent and shut the door is that going to help my A/C not run so much or does it make a difference.

I know it is going to run a lot right now since we have had temps in 100s for the last 2 weeks.

Keeper - Adding more rooms to a homes cooling system is bad, A/C units are designed for the size of the home. Closing off rooms should do nothing to it's efficiency but just might save you some money. The reason your A/C might be running so much could also be the moisture in the air. Some A/Cs are more efficient than others at removing the moisture. Also, check for any areas that could be letting that hot air in, like door frames, windows, etc.
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