Boston HVAC is a marketing company representing different HVAC contractors. A fact they do not make clear on their website at all. I was just charged $ 209 for a visit that lasted less than 40 minutes, most of it with the technician typing up an invoice and estimate on his phone that I still have not gotten surprisingly enough. The website says«HVAC Boston used flat rate billing for the time a technician is working» This is not the case and this particular company(Round the clock) charges a fee to diagnose the problem. All in all this is an extremely deceptive site and I highly recommend you get a recommendation from someone you trust rather than going through the site. The only reason I went with them is they list a local address on the site, which apparently is a sham.