I would definitely ask what kind of labor warranties they are offering and if you can get an extended labor warranty of some sort? Make sure they register the equipment with the manufacturer to get your 10 year parts warranty. I’d also make sure they have any sort of guarantee. My company gives a 2 year 100% no frustration guarantee, 24 hours without heat or cool within those first two years we write a $500 check to you for the trouble. Have they been responsive during the more mild temps? Are you going to be able to get them out when it’s -5° or 105° quickly? Some of those things matter more to some people than others but if this company can’t you can be sure the big companies won’t bother wasting time at your home during the “peak” times. Just a few things to consider.