The outdoor unit of our heat pump/AC system had been making a really loud rattling noise whenever the AC came on. It didn't make the noise when just the fan was on, and we couldn't tell if the fan was hitting anything inside the case. The technician arrived on time and was very friendly and easygoing. He examined the outdoor unit thoroughly, testing several different theories for the problem. As new homeowners, we felt he had a good understanding of our situation when he suggested starting with a low cost fix first (replacing just the fan), and holding off on a more costly repair (replacing the motor) only if needed. He also checked our indoor unit, provided basic maintenance suggestions, answered all of our questions honestly, and did not try to upsell us on additional services. He did leave information on the company's maintenance plan with us, but did not waste anyone's time telling us all about it right there, which may have resulted in a higher diagnostic visit fee. It may go against conventional business practices, but we really appreciated his straightforwardness and thought his manner reflected well on the company. Ultimately, my father brought his own technician to fix the problem, but if he hadn't, we likely would have hired Home Air Services. We would call them for repair work again.