I have a 5 year old Unico M Series modular air exchanger in my attic and have never had any issues with it until yesterday; this is a high velocity system with 2" duct tubing coming off of the main trunk. Yesterday, it rained extremely hard in my area and I noticed that a bathroom exhaust vent was leaking a small amount of water so I got my ladder out and went into the attic to inspect. My house is a split-entry and does not have an easy access to the attic so I have never really been up there other than poking my head through the access panel. When I went into the attic to inspect the roof around where the bathroom vent is located the AC was off at first but kicked on while I was up there. I immediately noticed hissing noises coming from the many of the AC supply lines. I took a look at several and they use twist on connectors to hook into the trunk and it seems that the leaking air I was hearing and could feel is coming from these twist joints. I called the company that did the installation for me this morning and they want to charge me a bunch of money just to send someone out to look at it and then more to fix it. I am hesitant to do this because I feel as though if there is a problem that it was an installation issue where those joints weren't properly sealed and that they should come and make that right (if they should have been sealed somehow in the first place).
My first question is, is the leaking air a problem? I would think yes as it would reduce the efficiency of the system. My second question is, should I have to pay for the company that did the install to come out and inspect/repair this if it was due to poor installation? Lastly, how are these twist on connectors normally sealed if they are at all (tape, sealant, etc)?
Thanks in advance,