Finding an HVAC technician you can trust is like winning the lottery. You can really be taken advantage of when you're sweating balls (literally) because your AC is on the fritz.
Luckily, Carl's is very trustworthy. They've been servicing my rental units for a few years and I'm always happy with their work. When one of the AC units completely broke, they came out the same day and completely replaced the rooftop AC unit within 48 hours. That's fast!
Their pricing is also reasonable, about $80 to diagnose. They also TRY to fix the problem before saying "replace the unit." I worked with two other HVAC companies beforehand that always told me to replace a unit while Carl's said "uh, yeah, it's a broken $20 part" and it could be fixed.
All in all, they've probably saved me thousands. So, yep, I love them.