Another way of looking at this might be to figure out how many
tons or BTUS those heat pumps would be. I don't know heat
pump ratings, but they are going to have to be in the range to
heat a house. So for those 4 small condos in DC, let's say the
total capacity needed is 100,000 BTUs. A typical window AC
unit is 6,000. So, when you're using the heat pump to heat
the house, it's like having 17 window AC units pumping cold
air into the basement. It doesn't sound like it would take very
long for that to drop the temperature way down. And the lower
the temp, the less efficient the heat pump is, the less heat you
get out, etc. In the summer, you would have the reverse, with
the equivalent of 17 window AC units pumping their heat into
No, but I'll see if I can find out and post back. Some of the wells are
supply and the others are return and which is which depends upon the water
temperature as well as what mode the heat pump is in (heat or cool).
In the wells we use, the loop is one continuous circuit. There is no
supply and return, each well has two pipes that are connected at the
bottom of the well. When the pumps are running the water goes down one
pipe and up the other to the next well. The HVAC units are either
extracting the heat or the cool from the loop based on the thermostat
requirements. If the well field is properly sized the circuit sheds
heat into the well field strata during the summer or heats the loop in
the winter. The idea is to provide close to a constant temperature in
the loop that is much closer to the desired room temperature than the
delta using outside air. It takes a lot more Btu's to heat a room using
the outside air at 0* than to work with a 55* loop.
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