I called for service as on the first day of this recent heat wave my air conditioning unit started sounding a bit on the rough side with a low rumble type noise. Ozzy was dispatched to check it out. Upon his investigation and testing, he found that there was no real cause for concern. The blower motor was still within specifications and did not need repair or replacement for the time being. He assured me it was just that it is an older unit and that there was no cause for concern as far as he could see. He advised that if things should suddenly change then they would return to investigate further and perhaps change out that blower motor.