Replaced old oil-burning boiler with gas unit. Drained and pressure-tested system (twice) to locate problems; fixed various minor problems. We have heat! Joe and Dan came out and did an initial diagnosis. They returned the next Saturday (again, on time!) for a follow-up and then were very helpful scheduling the work itself. They worked all weekend and, when unforeseen problems came up, they extended the job into the next week. I am sure they could reasonably have charged more, given all the extra work, but they did not, beyond some material costs. Good people. They were quick to come out for a couple of small follow-up fixes.