It seems like your HVAC unit always breaks at the most inopportune times. It never happens when a cold front is coming through, always a heat wave. When you're overheating and in need of HVAC repair, you're desperate to get the AC back on. But you should always take your time when getting HVAC quotes. Going with the first company you find may put you in a tough spot and cost you extra money. To makes things easier, we've put together this list of 6 essential questions to ask.