Need Appliance Repair Help? Ask a Technician for Answers ASAP
Mitsubishi Model MUZ-FH09NA outdoor unit and Model MSZ-FH09NA is what you should look at. Perform at 100 % at 0 degrees outside temp and 75% at 13 below outside temperature. You don't need a sump pump . The indoor unit only produces condensate in the summer , so it drains outside through the same hole as the wiring and refrigerant piping to the outside unit.
Did this unit work satisfactorily in cold weather before it failed ? If it did , then the new one will too.