I am also wary of Sun Kool ...
Sun Kool installed the HVAC system when my house was built in 2011. As I approached my 1-year anniversary, I received a call from Sun Kool saying that I was entitled to a free annual inspection.
The tech checked everything inside and outside. It was all good EXCEPT my wall-mounted thermostat was out of calibration and should be replaced. He could install a better, programmable model for $xxx.
I declined, knowing that it's a DIY job.
Then I did some research ...
1. My thermostat had a 2-year warranty. Gee, he never offered to replace it.
2. The calibration of my thermostat can be adjusted by the user, which I then did myself.
I'm still using the same thermostat today.
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