I have been in my house for 8yrs. We have a 2 zone system HVAC heat pump. The upstairs unit has given us problems every year, requiring the unit to be charged with refrigerant. Just yesterday(3-27-12) the repairman had to place 2lbs of R22 into the upstairs unit. He found the coils leaking refrigerant. He recommends replacing the whole system $$$ vs replacing just the coils.

1. What are some of the important questions I need to ask when getting an estimate.

2. Is having a leaking unit in our attic concern for toxicity with our 13 month old sleeping in the room below that unit?