We have 5 companies coming out to quote an installation estimate for a new heat pump/ac unit. Sears, Lowe's, Advanced, Dana's, and Airmasters. Before I get pricing, has anyone had experience with any of these? Who is best for customer service, quality installation, and reliability after installation? To be honest, just by the hassle it took to schedule my appt, I'm not too impressed with Sears so far.