Do not use this company - service charge is a cash grab. My HVAC situation at my Burlington unit was a complicated situation - combo heat/ac unit that was currently obsolete heat exchanger issue and needed a unit or part replacement. When I posted on Homestars looking for quotes HVAC Service was one company that immediately called me and sent a tech the next day - however they did not tell me there would be a service charge - but I was ok with that if they provided me with a quote so at least I could compare to the one quote I received (btw the quote I received all I needed to do was send a picture of the unit, serial number and space, they didn't need to go in to "see" the original unit prior to giving me a quote) HVAC service tech confirmed unit needed to be replaced or heat exchanger said he took pictures and that I should have a quote shortly. I followed up online on homestars, because no one followed up after tech visit, and HVAC said they needed to send someone in because no supplier could give part and needed to measure for new unit- I said I was expecting a quote and why does another tech need to be sent? especially when the first one took pictures. They said that tech wasn't an installer specialist. By this point I received a specific unit and model number/ser number I wanted quotes on. A few days later (note that the tenant is without heat so response time was quite slow with this company) saying they needed to send someone in and I responded with the specific unit with serial number I wanted a quote on - they said they would get back to me they never did. I got new HVAC installed with the other provider and so I asked for my money back from HVAC service since they didn't actually do anything - but they said they would not give it back since I didn't let them in the unit to measure for a new unit. They said I refused to let them in, which was not true, I explained I wanted a quote on a specific unit first and they never got back to me. They explained they couldn't get a quote on the unit - but only when I asked for my money back, they never relayed that to me, otherwise I would have let them in as I was looking for several quotes. Did not like my experience with them at all.