I had my unit serviced today for the first time since we built the house 7 years ago and I have a question regarding freon level.
Quick background: This past winter the outside unit started heavily frosting over and just thought I would wait until the spring to have a complete service clean and look over. A few days ago I went to replace the indoor filters and notice that water was dripping from the a-frame (it's a heat pump split unit) onto the floor under the unit, it was not going into the drain pan that the a-frame coil sits inside of. The tech cleaned the outside unit with an acid spray, checked all the wiring, and then moved inside. He stated that the indoor coils were clean and did not recommend cleaning them. We turned the unit on and he noticed the freezing up of the coils, which he stated as the reason I was seeing the dripping. He then checked the pressure (freon) levels and he told me the unit was holding about half of what it should. He added freon, checked that the register was showing a temp of 65 degrees, and told me he thought that would fix the problem.
Everything seems to be working better now, extremely cooler in the house now that it is working at full capacity with the freon level. My question is, is it normal to lose freon in the 7+ years that I've had it, esp. since I've never had it serviced?