Even people who are somewhat familiar with geothermal heating systems may not be aware that there are actually two types – open and closed loop systems. The difference, of course, is that the closed loop systems make use of a completely sealed loop of pipe filled with water, antifreeze or some combination of these that cycles through the pipe absorbing heat and transferring it to your home.
Open loop systems, on the other hand, are linked to a well casting and draw water from there to circulate throughout the system as a heat source. Particularly if you already have an appropriate well casting in place, you can often save a lot on your installation costs by putting in an open loop system rather than a closed loop.
If you do not already have a well, however, the installation of an open loop system might still be cheaper but not by as much. Also, the costs of operation after the initial installation are pretty comparable, so the relative costs associated with operating one type of system or the other should not weigh to heavily on your decision.
In fact, the best way to decide which type of geothermal heating system is right for you is to talk to an experienced contractor about your particular situation. They will be able to tell you exactly what the installation of each type of system will entail in your specific case and make informed recommendations about what type of system will work best for you.
No matter what type of geothermal heating system you do go with, though, you will be getting an excellent and inexpensive home comfort solution that will keep your indoor temperature at the right level all year round. That is because geothermal heat pumps, just like air source heat pumps, can be reversed during the warmer summer months to actually remove heat from your home. That way, you can stay cool in the summer and warm in the winter without having to pay for heating or air conditioning.