The MRCOOL Universal series consists of a selection of quality heating and cooling components, including heat pump condensers, air handlers, A-coils, and central heat pump split systems. Using a dip switch setting, the condensers can be field converted from 2-3 ton or from 4-5 ton depending on the model. Look for MRCOOL Universal series line sets in our MRCOOL Accessories category. The Universal series offers the following additional benefits: Low noise Slim condenser design Compatible with any third-part thermostat (including NEST thermostats) Versatile application Energy efficient (up to 20 SEER) 10-year warranty on all parts to original registered end-user Gold-Fin corrosion resistance Unlike the DIY series, the Universal series requires a professional to complete the installation process.