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Posted by jamesgangnc on October 24, 2006, 11:21 am
Now what would really be cool would be a internet capable thermostat
that periodically checked the ng and kw prices for your providers and
adjusted the transition point between the furnace and the heat pump
based on current operating costs using the indoor and outdoor
conditions, the efficiency of each unit, and the price of the fuel.
Noon-Air wrote:
show/hide quoted text
> >> Also electricity v/s fossil fuel cost.
> > Yeah!
> > Has NG gone up so much that a heat pump is competitive?
> Between the cost of NG goin up and the efficiency of heat pumps going
> up..... I would say yes.
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Posted by =?iso-8859-15?Q?Tekkie=AE?= on October 24, 2006, 9:38 pm
jamesgangnc posted for all of us...
show/hide quoted text
>
Don't top post -- because I said so.
show/hide quoted text
> Now what would really be cool would be a internet capable thermostat
> that periodically checked the ng and kw prices for your providers and
> adjusted the transition point between the furnace and the heat pump
> based on current operating costs using the indoor and outdoor
> conditions, the efficiency of each unit, and the price of the fuel.
>
We had Ken Lay & Jeffy Skillet at Enron doing that for us...
--
Tekkie Don't bother to thank me, I do this as a public service.
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Posted by John Gilmer on October 24, 2006, 8:35 pm
show/hide quoted text
> >> Also electricity v/s fossil fuel cost.
> > Yeah!
> > Has NG gone up so much that a heat pump is competitive?
> Between the cost of NG goin up and the efficiency of heat pumps going
> up..... I would say yes.
Well, I'll say this: when we moved from a town house with a/c and gas heat
to an all electric HP house that was LOTS bigger out total utility bills
were about the same. But I figured it had more to do with paying two
"meter" charges.
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Posted by Bubba on October 23, 2006, 3:41 pm
wrote:
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>>> Yes, it runs a lot
>>> more and no its not able to bring the temp up
>> at which point the efficiency is lost thus defeating its own purpose. i
>> suppose you could run both, but to me it seems pointless.
>You *DO NOT* want to run both the heat pump and gas furnace at the same
>time. You run the heat pump down to about 35 degrees, then heat pump is
>taken out of the loop, and the furnace comes on line.
>Think about *WHY* you don't want both to run at the same time......
>(HINT Think "head pressure")
>
35 degrees is too generalized. I had a heat pump today on a
"tune-em-up". Outdoor thermostat was shutting the heat pump off at 35
degrees. That was the temperature today so the heat pump wouldnt run.
I turned the stat down to 25 degrees. Went in and watched the heat
pump run. I had 98 degrees just out of the plenum. I'll run em down to
25 degrees outside anyday.
Bubba
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Posted by Nathan In Montana on October 23, 2006, 10:59 pm
show/hide quoted text
>>> Yes, it runs a lot
>>> more and no its not able to bring the temp up
>> at which point the efficiency is lost thus defeating its own purpose. i
>> suppose you could run both, but to me it seems pointless.
> You *DO NOT* want to run both the heat pump and gas furnace at the same
> time.
as i said above, i wouldnt run both.......but ive seen it done by folks
supposedly smarter than me.
show/hide quoted text
>You run the heat pump down to about 35 degrees
personally i wouldnt run it down that far, but im not anal about trying to
squeeze every possible btu out of a penny. id rather be comfortable, and
prefer to run a furnace at 40 or below. still, ive seen some that run the
heat pump down to around 20 degrees.
show/hide quoted text
> Think about *WHY* you don't want both to run at the same time......
> (HINT Think "head pressure")
again see my initial response above, i wouldnt ever recommend running
both......just that ive seen it done.
--
Nathan in Montana
http://ConcealedCarryForum.com
http://1911Tech.com
http://GlockCarry.com
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> > Yeah!
> > Has NG gone up so much that a heat pump is competitive?
> Between the cost of NG goin up and the efficiency of heat pumps going
> up..... I would say yes.