Performed start up on a new furnace. No gas leaks detected. Gas and exhaust levels are normal. No CO detected in the air. Drain is working. Heat rise was 52 degrees. High limit passed safety test. Unit is operating normally at this time. They said they have three different thermostats in the building and are interested in having only one type. We will need to set up a time to come back and replace two. There wasn’t a preference as to which thermostat. Something straight forward should do the job. Thank you for choosing Black-Haak! Please take the time to complete our online