The intelli-Heat Dual Fuel System from Mitsubishi Electric Trane HVAC US connects with any thermostatically controlled furnace. During periods of extreme cold, intelli-Heat may switch to a home’s gas furnace as needed using its intelligent switchover function. The unit connects to single-zone P-Series cooling-only or heat-pump units and multizone MXZ heat-pump units and is available in 18-, 24-, 30-, 36-, and 42-kBtu/h capacities. Hyper-Heating Inverter models provide 100% heating capacity down to 5°F outdoor ambient temperature and guaranteed operation to -13°F.