If the ground temperature is consistently 70 degrees Fahrenheit (21 degrees Celsius) and your desired room temperature is also 70 degrees Fahrenheit, you may not need a supplemental furnace or air conditioner in most situations. A geothermal ground source heat pump system is designed to efficiently heat and cool your home by utilizing the stable temperature of the ground.
During colder months, the ground source heat pump extracts heat from the relatively warmer ground and transfers it to your home, providing heating. In warmer months, it reverses the process, extracting heat from your home and transferring it back into the ground for cooling.
When the ground temperature matches the desired room temperature, the system will require little to no heating or cooling energy input. However, keep in mind that maintaining the exact 70 degrees Fahrenheit in your home might be challenging due to external factors such as sunlight, air leaks, and changes in outdoor temperatures.
In practical scenarios, some energy consumption might still occur to maintain the desired temperature, but it would be significantly reduced compared to conventional heating and cooling systems. The efficiency of a geothermal system is usually higher than that of traditional HVAC systems, resulting in lower energy bills and reduced environmental impact.
It's essential to have a properly sized and designed geothermal system for your home's specific needs and to ensure it's installed correctly to achieve optimal efficiency and comfort. Consulting with a professional geothermal installer or HVAC specialist can help you determine the best setup for your home and climate conditions.