With the internet, product research has become easy and second nature. So it makes sense to search for the best furnace / air conditioner brands, and check out different reviews, right? The problem is that when it comes to heating and cooling, it is typically the installer that makes the difference, not the equipment brand.
Installation quality impacts everything from actual efficiency to long term reliability. A bad installer can work with a brand and have a high break down rate, while a good installer can work with the same brand and have customers experience decades of trouble free performance.