Our air conditioner had been malfunctioning since we moved into our home last year. The copper piping kept icing up and the vents were only blowing lukewarm air. This seemed strange because it was a brand new AC unit. We had 3-4 different repair companies come by and each gave a different diagnosis of the problem. None of them were able to fix it. They all recommended replacing the coils, which would cost at least $600.
With my wife pregnant, there was no way we could sweat through another summer. On my dad's recommendation we tried Sierra Air. Despite being based in Mississauga, Alex drove all the way to the edge of north Toronto to our place. Within minutes he diagnosed the problem, which turned out to be leaks in the copper piping caused by poor welding. Alex fixed the problem that same day and our AC has been working perfectly ever since.
This is a highly professional company that I would recommend to anyone if you want a proper diagnosis of your HVAC problem and a speedy repair.