Service was prompt and professional. My concern was the $996 price for a gas valve replacement, for our Lennox 14ACX HVAC unit, it seemed exorbitant for a $200+- part. I gave the OK because the heater wouldn't turn on and it was cold. The Technician took a total of 2 hours including travel to get the part. I then had several calls from other Companies and after a very detailed description of the issue which was already being completed by Gundlachs all quotes were $300 to $500 less. I don't mind spending a little more for quality service but not 30% to 50% more. So beware if your looking for fair pricing I would look elsewhere. Also, I did not receive a itemized invoice, no part or labor breakdown.