At the time of getting my business, CLS/Fortress gave warranty commitments that turned out to misleading. The work they said would be done in 10 days, took them 3 months to complete. During the work they damaged external AC unit, and struck the gas meter so hard that gas line inside were damaged too. Despite informing them of the cost at the time, they refused to accept the damage cost at the time of settling the account until I stood my grounds. There were still leakages after the work, but for some reason it stopped by itself and been ok since last two months. But with 'limited warranty' they have give, I feel I have no coverage. My advice: Do not use them, find someone else.