[RFI] RF quiet HVAC

[Roger (K8RI)]

What about heat pumps that use ground water which 5 feet deep and down 
runs around 50-55F
Up here they either put down, 4 to 6 50' wells (give or take), or plant 
a large pipe network depending on the heating degree days.

73

Roger  (K8RI)

On 12/2/2015 1:10 PM, charlie at thegallos.com wrote:
>> You need to be in a warmer climate for heat pumps to work efficiently. I
>> have several units and my main floor one also has a propane furnace that
>> takes over when it is less than 30 degrees outside.  I have noticed no RFI
>> with any of my American Standard heat pumps.
>>
>> John KK9A
> Yes, a lot of people don't think about it, but let's say you like your
> house at 70 degs F - a HOT day, of 100 F has a temp delta of 30 degs, and
> MOST HVAC systems actually have problems keeping up with that, and might
> not actually be able to keep you at 70, but might bring it to 74 or so -
> but let's say it can maintain 70.  That's about what systems are sized for
>
> Now it is winter, and you still want to maintain 70 degs.  A 30 deg delta
> in temp is 40 degrees.  Any COLDER than that, you have to start over
> sizing your heat pump.  Want it to work at zero F? Yep, you need a 70 temp
> delta, more than twice as much BTU wise (and it is harder to make those
> BTUs)
>
> Heat pumps work best where the two sides of the desired temperature are
> roughly the same - figure NC Shore and south, along the south, and up the
> west coast.  Most heat pumps are available with aux heater coils, but then
> you have that additional cost to run
>
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