It was the coldest day of the year and our twenty year old Honeywell furnace stopped working. The pilot was on but there was no heat coming out of the radiators. I called one plumber who came and worked on it for half a day. He went to get parts twice but still did not have any success and was not able to figure out what was wrong. Then I called Rite Temp and, although he wasn't able to come immediately, when he came the next day he diagnosed and fixed the zone valve problem in about half hour. Finally we had heat again!