I have used Arendosh Heating & Cooling on four separate occasions. Each time I've been able to get a quick appointment, in fact, today I got an appointment two hours after I've called, and had a professional, friendly service person each time.
The services they've performed have ranged from replacing a burnt out motor in my HVAC unit, having the vents cleaned, to replacing a thermostat (that I broke!), to recharging my A/C with freon.
Are they cheap? No - but they do a good job and in my experiences have never taken advantage of me or tried to get me to have services done that I didn't need. The service call is $95 and then you are charged for whatever needs repaired or for parts. I'll continue to call them when I need HVAC repairs or vent cleaning.