The MRCOOL GeoCool 4 Ton Geothermal Split System boasts an all DC inverter system with a high-precision electronic expansion valve, offering temperature control precision that surpasses conventional systems. Its open or closed loop water-to-air system boasts an impressive EER of up to 70. If your property boasts a nearby water source, such as a lake, well, or pond, you can opt for an open-loop system, which offers optimal installation and maintenance savings. In the absence of such water sources, a closed-loop system can be installed, utilizing propylene glycol through underground tubes to circulate air efficiently in and out of your home while conserving energy compared to standard HVAC systems. The co-axial copper-nickel heat exchanger enhances corrosion resistance and unit reliability, making it suitable for environments with lower water quality and salt solutions. Operating at a quiet cooling noise level as low as 58dBA and heating noise level at a minimum of 60dBA, this system ensures minimal disruption to your daily life. Maintenance is also a breeze, thanks to easy filter access. The system is backed by a 5-year labor warranty and a 10-year parts warranty. Consider the MRCOOL GeoCool 4 Ton Geothermal Split System as your choice for an environmentally responsible, budget-friendly, and hassle-free solution.