Does this "sound" right? Had a Lennox CBX27-UH-036/20KW (Electric) furnace and a XP14-030 2 1/2 ton AC/Heat Pump installed in August 2009. Seemed to run ok until the first night temp fell below freezing. Woke up to NO HEAT! Unit had not been wired to the thermostat correctly! A senior technician came out and re-wired it. After that we noticed that each time the heat pump would kick in, there was a seemingly loud "clunk".....called the installer and the same senior tech came out and added a "booster" unit. He said they are usually needed in colder climates (well, crap, this is North Dakota) so why wasn't it done at installation? Anyway, we also questioned how often it was cycling and the initial installers had set it for the max - 9 times per hour! He then reset it for 3 times per hour. We're still hearing the noise on startup, though it isn't as loud. Is this a problem? (Have also had a terrible time getting this company to register our extended warranty - tomorrow is the 90 day deadline, or get the tax rebate information certification papers to us.) Just want to clear all this up before 20 below! Thanks for any help!