Great for fixes. Mediocre? Worse? for replacement.
We had a terribly old system that we had various area A/C teams fix over a period of a couple years. The system had a small coil leak and some electronic breakdowns that were relatively inexpensive fixes ($300 or less). During those fixes TX AC Specialists were by far the most informative and reliable guys to call - we had others come and say we just needed to replace the whole thing without even looking around, etc. TX AC always agreed with the sentiment that it was time to replace it but would spend the 15 minutes to half hour to diagnose our problem and fortunately for several times in a row the fix was minimal or a not-too-bad refrigerant recharge.
That is how TX AC gets your business. They have A++ repair men, but install is not as good.
In late 2013 during one of the cold spells it was just time to replace the system. The sales guy who came out seemed fairly informative, quoted us XYZ system and said we'd get a number of discounts.
The XYZ system was a 3.5 ton carrier unit that by the sales guy estimation needed two intake vents where our house only has one. Adding the second intake vent would be included in the price he said and would be just such and such through this wall.
Turns out, sales guy not so good at math in various ways.
Math problem #1: One of the discounts he claimed I get, some $400 refund, didn't even exist - Fortunately one of the founders of the company sent us a check for $400 out of their own pocket after I complained about this.
Math problem #2: The second intake install was not as easy as they sales guy's first glance said it would be, the intake needed to go through a wall, yes, but there was a closet behind it with some open air before the next wall - which I guess was not how he wrote the quote.
Math problem #3: Possibly caused by math problem #2, the unit sounds like a jet engine in our house. Sure, it actually works fine compared to our 20 year old unit, but we have trouble sleeping at night when its on and our living room TV has to be turned up very loud to hear over this new unit.
Math problem #4: Typical sales BS about how much money we'd save in electricity each month replacing that old 20+ year old unit. The thing here is, when your old A/C doesnt work, you use it less to just get by. When the new unit is installed, you use it like a normal A/C, more often, running it at 75 in the summer rather than 80, etc, and even so, with 20 year newer technology our bill stayed the same.
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Our install experience was the same as others have mentioned. Nobody on the team spoke english, or barely did. When they came out they noticed the airgap to bridge through the closet and just decided they couldn't do it for the second vent.
They also let one of our cats out by leaving the garage door open, despite me being in the house and having very explicit conversations with them about how we could manage not letting the cats out (lock the cats in the bedroom most of the time, then at a certain time I'll let them out to go eat and so on, but DONT open the garage during that 1 hour window). Naturally, cats being cats, one of them hid in the garage so we were careful to agree on the situation (DONT open the garage until I find it, just leave the garage shut). Apparently Don't open the garage doesn't translate to spanish because I came out in the garage looking for the cat fifteen minutes later and naturally the garage was wide open. Thanks guys. Cat survived, no thanks to these minor league technicians.
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So, install not very smooth, but the unit worked! It was loud as hell, and its been perfectly operational for a year - so I would say these guys are technically proficient at minimum on install in that the unit actually works, but the polish you see when their A+ list all stars come to fix things is not there on install, and you'll likely be disappointed.
We did call their guys out of exasperation about the noise a few months after install, and their guy (again, one of the a+ all star knows his stuff fix guys, not the backup little league install team guys), and he says the way to fix the horrible jet engine sound problem is either get that second intake vent (no way?! you don't say?!) or have the install team move the unit further away from the vent into the house which was going to be $1K to $2K.
$2K to have that install team in my house again, probably screwing something else up further? No thanks.
At this point my wife and I are hoping the entire unit dies under the warranty period due to lack of air intake misconfiguration by their installers so they can do it the right way the second time. But, to our dismay, the jet engine keeps on working just fine - so, as I said, to their credit, the damn thing actually works at all, which is surprising given the math problems and miscommunication problems from sales guy to team.
Use these guys for minor fixes, don't let them install a unit in your house.