Harm > Good
This is quite the inane thought, but when service tech people screw up ... wow, you can really notice it. Whether it is your car, the A/C in your office, or whatever ... in general, you can trust that these people will do the job right and life can go on
But, man, those few times they mess up ... well, the techs came to mess with the A/C in our office space. Now our central A/C blows unrestrictedly on high and at a pretty uncomfortably chilly temperature ... and we were told last Friday, it may be mid-week before someone comes to correct it
Bust out the parkas, it's XM in July