I unfortunately had an awful experience with S & J Jamrog when I asked them to look at my icing over furnace/central air unit. They charged me nearly $300 to completely misdiagnosis the problem. They took my thermostat apart and didn't replace it correctly so they claimed that a broken thermostat was the issue. They assured me that they would get back to me with a estimate of the work needing to be done (replacing the thermostat and the board on the furnace) the NEXT DAY. It was after us constant badgering that a week later they texted us with an estimate for $1400!
In the meantime we had another company come out to diagnose the problem and they fixed it on the spot (cleaned our central air unit and added freon- and did not replace our perfectly working thermostat) for $210 total and it has been working perfectly since.
I got the $270 diagnoses bill from Jamrog and they charged me $85/hr for each of the two people who came out even though it was a one person job. And they charged me for 1.5 hours of their time even though they were only here for less than an hour. I do not trust their business practices!