It should have a night time set back via the timer function, linesets normally are not included unless the company that's distributing decides to add it but it wont be pre charged. If you want to know everything there is to know about Mitsubishi go to website mylinkdrive.com and chose the flag from what ever country you may be from and you'll find everything you ever wanted to know about that brand. I think Mitsubishi and Daikin are the 2 best brands but the others will work fine as long as you install them properly and are sized right, make sure you have all the options you want. My opinion only, is that seer ratings are more of a sales gimmick than very practical. I'm sure i'll catch some hell for that but that's how I feel, I could go into a very long story to say why but I basically don't think its a big deal.[/QUOTE
IMO, for our industry, seer ratings don't matter as much as they will for another type of customer. For the most part mini split seer ratings are based on the fact that the unit will be running at partial speed some of the time. In our industry that doesn't happen as much. But for a residence, seer ratings do matter and will save money because their heat load is more fluctuating and the unit will run at partial speed more.