Your questions answered: HVAC FAQs. Knoechel Heating Company in Zelienople can answer all your HVAC-related questions. Before you get on the phone, look to see if we already responded to your question online. If you don’t see your question on the list or want more information on a topic, give us a call at 724-452-6280. Our staff can give you the information you’re looking for in no time.