Yes, geothermal HVAC systems are reliable. Geothermal systems use the natural heat of the earth to heat and cool your home, making them an efficient and cost-effective option. They are also low-maintenance and require minimal upkeep, making them a reliable choice for homeowners. Additionally, geothermal systems are designed to last for decades, making them a long-term investment. With proper installation and maintenance, geothermal HVAC systems can provide reliable heating and cooling for many years.