We already had forced air heating, but needed to upgrade to Natural Gas as our oil tank was messy and took up too much space. The whole project was fairly painless and the guys did a great job venting the unit inconspicuously out the back of our house. They did bang up a few of our mouldings with equipment and sometimes the main contact didn't call us back very quickly to answer our questions. They also ended up putting in a unit that we couldn't even get an energy star rebate with - which was part of the original goal. All in all, the system works great and the contract includes a free inspection/maintenance 1 year after purchase.