Hi All, I've seen a bunch of threads on this topic but I thought I'd ask a couple of questions that were specific to my situation. Earlier this week I noticed that my ac unit wasn't cooling at all. I could hear both the inside and outside systems working and I could feel air blowing out of the vents ever so slightly, but it wasn't doing the trick. I checked the lines outside and noticed that they were frozen. I shut the system off for about 3 hours yesterday in 33C heat and allowed it to thaw. During this time I thoroughly cleaned the permanent filter using my garden hose and while it was drying, I switched the system back on and ran it for an hour or so without a filter. I could finally feel cooler air from the vents and hoped that I had solved the problem. I replaced the filter before going to bed last night when the thermostat read 30C. I woke up this morning and the temperature in the house had dropped to a more bearable 26C but I could barely feel any air coming from the vents. Upon closer inspection, I noticed that the ice was back on the extrenal pipes. Once again I shut the system off (moved the fan to ON) and have allowed it to thaw all day today (about 10 hours). On my way home tonight I plan on picking up a disposable filter and trying that out to see if it makes a difference. If the pipes freeze up again, I'll assume it's due to a lack of freon and will have a technician come out and inspect the system. My questions are: 1) Is there anything else I can try to get this going without having to shell out $100+ for a repairman? 2) If I have to top up the freon, how much will that cost? Let's say 2 lbs worth. 3) I've heard that pipe freezing may be a sign of a leak in the coils. Where can I find these coils? The large copper pipe from the external unit is covered by black insulation tube (save for the end which is exposed and freezes) and runs directly through a wall into the basement and into the internal system. I removed the panel on the internal system last night and can see what looks like a motor (among other fancy stuff!) but I have no idea what "coils" look like. Sorry, hardcore noob when it comes to this stuff. If anyone can help, I'd really appreciate it. I have a tech visit booked for June 7 but if I can avoid the fees and fix it myself, that would be great. Thanks everyone and sorry for making this so long!

I Have central air but need a Window unit/Through the wall unit, to supplement my central air. I have a room over top my garage that I would like to put an A/C unit in and vent onto the garage. It gets very hot in the area that the coil and exhaust would be behind the wall. I had bought a frigidaire 12000 BTU (window unit)from lowes and the first thing it said in the installation manual was not to vent it into a garage. Why is this? Are through the wall units any different? I know about the split systems but they are usually $1500 or more. Thanks, Frank