When they say they warranty their work, they really do! We needed a slight change to the original work (not an error, just some tweaking), and Dave came straight out to help. He found out that we were low on Freon, and that there was a leak from when the original builders installed our unit. He hooked us up with what we needed for a great price. AND fixed our leak for free!! Always such a relief to find great companies to work with. :)