I understand why new furnaces are more efficient, but why AC?

Posted by mm on November 5, 2009, 9:16 pm

wrote:

>wrote:

>>I think I understand why new furnaces are more efficient, but why AC?

>Technically, I don't know.

Great answer.

> But window ACs, and even refrigerators,
>are a lot more efficient now, too. Could just be the insulation on
>the fridge, but just better engineering of blowers and fins and stuff
>can help, too. Just electric motors that don't surge but have
>electronics driving them, I think, maybe venting motor heat outside
>instead of inside, etc.

Also good. :)

>J.

Posted by mm on November 5, 2009, 9:16 pm

wrote:

>wrote:

>>I think I understand why new furnaces are more efficient, but why AC?

>Technically, I don't know. But window ACs, and even refrigerators,...
>J.

And thanks, all.

Posted by Frank on November 6, 2009, 7:22 am

mm wrote:

> wrote:
>

>> wrote:

>>> I think I understand why new furnaces are more efficient, but why AC?

>> Technically, I don't know. But window ACs, and even refrigerators,...
>> J.

> And thanks, all.

Some good answers. I don't know the technicality but when I got a new
AC a few years ago, my summer electric bill was halved.

Posted by mm on November 6, 2009, 11:00 am

On Fri, 06 Nov 2009 07:22:16 -0500, Frank

>mm wrote:

>> wrote:
>>

>>> wrote:
>>>> I think I understand why new furnaces are more efficient, but why AC?
>>> Technically, I don't know. But window ACs, and even refrigerators,...
>>> J.

>> And thanks, all.

>Some good answers. I don't know the technicality but when I got a new
>AC a few years ago, my summer electric bill was halved.

Thanks.

Posted by ransley on November 6, 2009, 7:11 am

> I think I understand why new furnaces are more efficient, but why AC?
> I finally read an explanation about the exhaust air being cooler, as
> low as 90 degrees F from gas furnaces, and more heat extracted from
> the fire to heat the house, in new furnaces. =A0I presume new oil
> furnaces are more efficient the same way.
> But why are new AC's more efficient. =A0 There is no cold air going up
> the chimney with an old AC. =A0I presume that if the refrigerant doesn't
> lose all its coldth, warm up to room temperature, in the AC evaporator
> inside the main air duct, when it returns to the condensor, it's that
> much easier to condense because it is colder, and less heat has to be
> radiated out from the condensor fins. =A0So iiuc there is no loss there,
> at least if that pipe is insulated.
> So why are the new ACs more efficient?

The same reason new refrigerators can be 75% more efficent than units
30 yrs old, they were designed with efficency, not profit, as a goal.
www.energystar.gov

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