I built a new house last summer and had a Carrier heating and central air system installed. I fired up the system this summer after having it off all winter and it ran but didn't cool.

The tech came by and told me it just needed a charge. He said the units are supposed to be shipped with a full charge and sometimes they don't really have a full charge. When they are installed they are supposed to check and make sure the system is full. He said the installer must not have checked this one.

My question, Is this really how it works? How do they ship an uninstalled system with a full charge? Do I have a leak and he just didn't want to have to find it and fix it? Just want to make sure everything is being done correctly.

Thanks guys,