The refrigerant (freon) in any air conditioner should last the life of the unit. If not, you have a leak.
Yes.
nowhere
There are a few reasons why a central air unit is not blowing cold air. The coils may be dirty, the unit may need freon, or the thermostat could be broken.
Never, unless you have a leak.
It means that the unit is low in freon and the line temperature is to low.
depends on freon type,quanity,hourly rate of hvac co.
To buy ac Freon you need to be certified and to add ac Freon to central air conditioning unit is risky.The air conditioner filters are normally located in return duct grills or in the air handler. Read how to change air conditioner filters.
no. How could you have a leak without a leak? There's a hole in the system somewhere.
They use R410a eco friendly refrigerant gas now.
yes, older units could take between 9 and 15 lbs of freon most take about 12
yes