Air Conditioning Associates was fast in their response and their HVAC tech, Tony, was amazing. When the heat pump failed in the house I recently bought and moved into, he discovered that it had been extensively rewired by others during previous attempts to repair it. This caused a circuit board controlling it to burnout so he replaced that. There was even a replacement motor squeezed into it that was larger than the one for which it was designed. Tony worked to return the heat pump to stock condition by replacing the wiring, some of which had been altered to bypass certain necessary circuits. He had to divide the work into 2 trips and on the second one he replaced the oversized motor with an appropriate spec one. The result was that the fan on it once again fit properly within its shroud. His replacement of the wrong motor eliminated an exceedingly annoying vibration felt throughout the house whenever the heat pump was running. In the process of all this work, he found and resolved the likely cause of the previous failures of the heat pump which had resulted in the patchwork of inappropriate repairs created during the previous owner?s attempts to get it to work. The best part is that Tony saved me many thousands of dollars in heat pump replacement costs, something I would have had to do had he been unable to meticulously work his way through the mess he encountered. I can only offer praise of ACA and Tony - I highly recommend them! One last point, contact them directly rather than via Angie's List's email system. I had attempted to contact them via Angie's List for a job on my old house but they didn't respond to that. Turns out that they only respond to direct contact at their phone number or email address.