I thought I'd pass along all the recommendations I received: - Wade Heating & Cooling has been taking care of my A/C units, and furnace too, for ~15 years now. They've been pretty reliable. - Gary Moore of Arch Moore Heating & A/C, 412/731/7900 is a master. - Anthony Stamatopolis--412.926.0587. Alpha to Omega HVAC. - We’ve had excellent service on our system from Tudi Mechanical. - Air Pro --reasonable prices 800-749-0642. - Accurate heating and air conditioning. - Paul Tedesco. He's a local guy. https://www.tedescoheatingandcooling.com/ Rob Schwartz