I assume for some important companies you have to make sure they are certified, but when it comes to HVAC system, I never thought that I would have to make sure that they are certified too. I mean, everyone do is work on air conditioning systems plus heaters, why would they need to be certified for that? Well, I l acquired the hard way. All I wanted was for my heating plus cooling component to have a tune up, I didn’t need anything complicated appreciate a Heating plus Air Conditioning installation or Heating plus Air Conditioning repair. I saw there was a company I had heard of before, plus since I appreciate to try modern sites, plus the air conditioning system company was cheap, I decided to go with them. I didn’t even spend money attention to whether they were certified or not. Well when the afternoon of the appointment came, everything went as planned as far as the guy came over plus I thought he was maintaining my air conditioning system plus oil furnace. However, when the guy left, it wasn’t until later that I noticed I was vastly overcharged. I had to call my bank plus get my money back, plus I found out that the supplier was a scam. I reported them, plus I made sure to only go with certified companies from that point on. If you need anything done involving Heating plus Air Conditioning, make sure the company you go with is certified too… You wouldn’t want to go through what I had to go through, especially since I could have lost my money.