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  #1   Report Post  
Conase
 
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Default Heat pumps + cold climates

I was looking at some of the houses for sale in eastern Pennsylvania.

Since there is massive building going on in SEMI-RURAL areas for all the NJ and
NY people currently moving there, I notice that some of the houses both new and
old have HEAT PUMPS for their source of heat.

I have always heard that heat pumps are NOT that effective in COLD climates.
The weather in this area can get to the 20º and below mark for long stretches.
In a BAD year, the temps can linger at 10º for long periods of time.

Comments ?
TIA
  #2   Report Post  
TOM
 
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Default Heat pumps + cold climates

Air-exchange heat pumps stall out at about 35F outside air temperature, so
electric resistance
heating kicks-in. If you have a ground-exchange heat pump, it works against
the ground
temperature (59F average across the US) and does not have this problem. It
thus uses a lot
less electricity (heating or cooling) but that has to be balanced against
the much greater installation
cost (buried heat exchange tubing). Last time I investigated, the
incremental cost of installing the
ground-exchange in a residential situation achieved payback in about 20
years. This is usually
considered a poor investment. With rising energy prices, the payback period
may have changed
since then.

-- Tom




"Conase" wrote in message
...
I was looking at some of the houses for sale in eastern Pennsylvania.

Since there is massive building going on in SEMI-RURAL areas for all the

NJ and
NY people currently moving there, I notice that some of the houses both

new and
old have HEAT PUMPS for their source of heat.

I have always heard that heat pumps are NOT that effective in COLD

climates.
The weather in this area can get to the 20º and below mark for long

stretches.
In a BAD year, the temps can linger at 10º for long periods of time.

Comments ?
TIA



  #3   Report Post  
Dr. Hardcrab
 
Posts: n/a
Default Heat pumps + cold climates


"TOM" wrote

Air-exchange heat pumps stall out at about 35F outside air temperature, so
electric resistance
heating kicks-in.


Stalls out?

I think you should either explain that statement or not make it at all if
you do not know what you are talking about.



If you have a ground-exchange heat pump, it works against
the ground
temperature (59F average across the US) and does not have this problem. It
thus uses a lot
less electricity (heating or cooling) but that has to be balanced against
the much greater installation
cost (buried heat exchange tubing). Last time I investigated, the
incremental cost of installing the
ground-exchange in a residential situation achieved payback in about 20
years. This is usually
considered a poor investment. With rising energy prices, the payback

period
may have changed
since then.


Sounds like you DO know what you are talking about when it comes to
GSHPs....


  #4   Report Post  
tflfb
 
Posts: n/a
Default Heat pumps + cold climates

Mine is a 16 seer and keeps the house 69 degs, with the t/stat set to 72
degs.

17 deg outside temp,Nebraska weather.

Tom


"Conase" wrote in message
...
I was looking at some of the houses for sale in eastern Pennsylvania.

Since there is massive building going on in SEMI-RURAL areas for all the

NJ and
NY people currently moving there, I notice that some of the houses both

new and
old have HEAT PUMPS for their source of heat.

I have always heard that heat pumps are NOT that effective in COLD

climates.
The weather in this area can get to the 20º and below mark for long

stretches.
In a BAD year, the temps can linger at 10º for long periods of time.

Comments ?
TIA



  #5   Report Post  
Travis Jordan
 
Posts: n/a
Default Heat pumps + cold climates

Conase wrote:
I was looking at some of the houses for sale in eastern Pennsylvania.

Since there is massive building going on in SEMI-RURAL areas for all
the NJ and NY people currently moving there, I notice that some of
the houses both new and old have HEAT PUMPS for their source of heat.

I have always heard that heat pumps are NOT that effective in COLD
climates. The weather in this area can get to the 20º and below mark
for long stretches. In a BAD year, the temps can linger at 10º for
long periods of time.

Comments ?
TIA


Do any of these homes also have conventional furnaces (i.e. heat pump +
gas)? In your climate I would think that would be a good alternative to
a straight heat pump.




  #7   Report Post  
American Mechanical
 
Posts: n/a
Default Heat pumps + cold climates


"TOM" wrote in message
...
Air-exchange heat pumps stall out at about 35F outside air temperature, so
electric resistance
heating kicks-in.


That statement might have been correct 15-20 years ago. Today, it just
isn't the case.


If you have a ground-exchange heat pump, it works against
the ground
temperature (59F average across the US) and does not have this problem. It
thus uses a lot
less electricity (heating or cooling) but that has to be balanced against
the much greater installation
cost (buried heat exchange tubing). Last time I investigated, the
incremental cost of installing the
ground-exchange in a residential situation achieved payback in about 20
years. This is usually
considered a poor investment. With rising energy prices, the payback

period
may have changed
since then.

-- Tom


Geothermal's are very efficient but as mentioned, installation expense is
much higher than air-air.

- Robert


  #9   Report Post  
PrecisionMachinisT
 
Posts: n/a
Default Heat pumps + cold climates

"HA HA Budys Here" wrote in message
...

In the Northeast, your most cost efficient form of home heating is still

an oil
burner.


What about coal ???

--

SVL


  #10   Report Post  
TOM
 
Posts: n/a
Default Heat pumps + cold climates



At 35F, my 11-year old unit can maintain house temperature at 68F, but
has difficulty raising the temp. The run time
asymtotically approaches "forever". The thermostat automatically kicks-in
resistance heating when it detects that the
heat pump is unable to make headway after 2 hours. Thus, the heat pump is
stalled in it's ability to increase the temperature delta.
The outside and inside temp delta varies between various heat pumps, is
dependent on how well the house is insulated, and on the
heat pump capacity (in BTUs) compared to the floorspace of the house.

-- Tom



"Dr. Hardcrab" wrote in message
...

"TOM" wrote

Air-exchange heat pumps stall out at about 35F outside air temperature,

so
electric resistance
heating kicks-in.


Stalls out?

I think you should either explain that statement or not make it at all if
you do not know what you are talking about.





  #12   Report Post  
American Mechanical
 
Posts: n/a
Default Heat pumps + cold climates


"TOM" wrote in message
...


At 35F, my 11-year old unit can maintain house temperature at 68F, but
has difficulty raising the temp. The run time
asymtotically approaches "forever". The thermostat automatically kicks-in
resistance heating when it detects that the
heat pump is unable to make headway after 2 hours. Thus, the heat pump is
stalled in it's ability to increase the temperature delta.
The outside and inside temp delta varies between various heat pumps, is
dependent on how well the house is insulated, and on the
heat pump capacity (in BTUs) compared to the floorspace of the house.

-- Tom


Tom,

Heat pump performance gradually decreaces as outside temp drops. Many times
the run time is greatly increased, but that does not mean that it isn't
working nor that it is costing more to operate and maintain the house
temperature.

- Robert





"Dr. Hardcrab" wrote in message
...

"TOM" wrote

Air-exchange heat pumps stall out at about 35F outside air

temperature,
so
electric resistance
heating kicks-in.


Stalls out?

I think you should either explain that statement or not make it at all

if
you do not know what you are talking about.





  #13   Report Post  
Michael Daly
 
Posts: n/a
Default Heat pumps + cold climates

On 28-Jul-2004, "American Mechanical" wrote:

Which no tract builder ever installs. Ever.


Absolutely true. My response was to Tom who mentioned the efficiency of
ground source.


Does anyone seriously think that energy costs are going to go down any time
soon? I wonder what it will take for folks to realize that paying these
costs up front will pay back in the long run.

Mike
  #19   Report Post  
LBaker
 
Posts: n/a
Default Heat pumps + cold climates



And your local power plant is powered how?

Central A/C was not a consideration in my decision. Don't have it, don't

need
it, don't want it.

When I had a circa 1975 oil burner to provide both heat and domestic hot
water, I would fill a 280 gallon oil tank 3-4x a year. W/O a service

contract
or automatic delivery, I paid no more than 1.25 a gallon in winter, and
averaged about .90 a gallon overall.

That's about 1000.00 in heating costs per year.

I've since converted to natural gas. My monthly bill is 52.00 on the

budget
plan, and I didn't buy the most efficient WH or boiler available either.

That's
624.00 a year. Saving 376.00 a year (even with the spike in the past

year's
natural gas prices)
Payback comes in a little over 6 years.

Even if I had the ductwork to accomodate a heat pump, and never used the
cooling option, electricity here is just under .16 per Kwh. And it's all
generated by either natural gas or OPEC's oil.

Depending on where the OP buys, homes in Northern NJ pay almost the same

rates
I do. In Pennsylvannia one could easily pay 1/2 that rate, as well as in

areas
in upstate NY that "have access to cheap hydropower"


Let's see, we have 2 nuclear and 2-3 hydro plants within an hours drive. Not
to mention a coal burner or 2.


  #20   Report Post  
HeatMan
 
Posts: n/a
Default Heat pumps + cold climates


"LBaker" wrote in message
...


And your local power plant is powered how?

Central A/C was not a consideration in my decision. Don't have it, don't

need
it, don't want it.

When I had a circa 1975 oil burner to provide both heat and domestic

hot
water, I would fill a 280 gallon oil tank 3-4x a year. W/O a service

contract
or automatic delivery, I paid no more than 1.25 a gallon in winter, and
averaged about .90 a gallon overall.

That's about 1000.00 in heating costs per year.

I've since converted to natural gas. My monthly bill is 52.00 on the

budget
plan, and I didn't buy the most efficient WH or boiler available either.

That's
624.00 a year. Saving 376.00 a year (even with the spike in the past

year's
natural gas prices)
Payback comes in a little over 6 years.

Even if I had the ductwork to accomodate a heat pump, and never used the
cooling option, electricity here is just under .16 per Kwh. And it's all
generated by either natural gas or OPEC's oil.

Depending on where the OP buys, homes in Northern NJ pay almost the same

rates
I do. In Pennsylvannia one could easily pay 1/2 that rate, as well as in

areas
in upstate NY that "have access to cheap hydropower"


Let's see, we have 2 nuclear and 2-3 hydro plants within an hours drive.

Not
to mention a coal burner or 2.


From what I hear, hydro doesn't produce as much as people think. (at least
around here)




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